About Mathews: Technology

We develop Technology. We also create bows.

When it comes to building the ultimate bow, without a doubt it’s got to have speed, a smooth draw-cycle, tack-driving accuracy, and a dead-silent shot….all wrapped up in a light-weight package. After two decades of designing and manufacturing the most advanced bows in the industry, Mathews has once again raised the bar.

The essence of engineering is to make something function better while also making it simpler.

Technology SpeedThis is the heart of Mathews innovation. It is what inspires Mathews founder Matt McPherson to continuously develop and refine the compound bow.

Since the single cam’s groundbreaking inception in 1992, the benefits were obvious. Not only were the synchronization problems of the two-cam system eliminated, but a number of other advantages were quickly realized. Over the years, Mathews’ single-cam bows have proven to be more efficient, more accurate, more forgiving, produce less vibration and recoil, are quieter, and require less maintenance than any other cam system available today. In addition, the single cam has also proven to be fast. The Max Cam, introduced in 1997, and most recently, the SimPlex™ Cam, are both testaments to the amazing speeds that are attainable with this simple, yet highly effective system.

In 2009, Mathews once again made history with the introduction of the McPherson Series, Dual Cam line. The McPherson Series bows featured the new AVS system resulting in the fastest and highest performing dual-cam bows in the archery industry.

In addition to advancements in cam technology, it should also be noted that the bow string, particularly the material it is made of, also influences bow speed. While most bow hunters sacrifice string stretch for increased speed, Mathews owners are never forced to compromise.


Easy to draw and a pleasure to shoot.

While many bows on the market can claim high speed ratings, very few can offer such performance in a bow that is easy to draw and a pleasure to shoot. However, Mathews owners are never forced to compromise between smooth shooting characteristics and fast arrow speed. Thanks to ingenious cam designs and the revolutionary Reverse Assist Roller Guard (which replaces old-fashioned cable rods and slides), harsh draw-cycles and speed no longer go hand-in-hand. The major advantage of the Reverse Assist Roller Guard is that it reduces friction; resulting in much smoother draw cycle by positioning cables in a reverse manner; in front rather than behind the roller guard. Traditional roller guards position cables on the back side of the roller guard and cause the cables to wrap tighter as the bow is drawn back and therefore places more pressure on the cables. The Reverse Assist Roller Guard allows the cable to roll with less tension in a fully contained roller guard and ultimately makes the bow smoother since there is less tension on the cable.


Just like speed and accuracy, a quiet shooting bow is a must.

When it comes to quiet performance, Mathews is the industry leader. Matt McPherson realized early on the sound squashing affect that parallel limbs could have on bow design as well as their affect on speed and efficiency. In 1996, Mathews introduced the Signature. This bow featured a proportionately longer riser and shorter, more parallel limbs. Because the limbs were more parallel than other bows at the time, the vibration and recoil generated by each was effectively canceled.

Since that time, Mathews bows have continuously featured limbs that become more and more parallel. Today, the limbs on Mathews bows have gone beyond Parallel, resulting in an even longer riser and therefore increased stability. As a result, these bows are the quietest, most vibration free bows ever. With the launching of the Harmonic Damping System in 2000, a new era of quiet, vibration-free shooting was born. Never before had a technology made such an impact not only within the archery community, but outside it as well. Today, the Harmonic Damping System is one of the most recognizable and effective bow accessories on the market. Additionally, the Harmonic Stabilizer, Monkey Tails, String Suppressor and String Grubs combine to make the quietest-shooting bows on the market.

What good is speed without accuracy?

When it comes to shooting precision, the key is in the DNA. You see, Mathews bows are engineered to be accurate. This is evident in their forgiving Brace Height, long, stable Grid Lock risers, and the SlimFit Inline and Focus grips; both of which greatly reduce bow-hand torque.

One look at the Mathews Professional Shooters track record will confirm that they shoot the most accurate bows in the world. That same, tournament-winning technology can also be taken into your favorite treestand, ground blind, or mountain trail.


Careful engineering is what made the long riser/light weight combination possible.

In an effort to make bow limbs more parallel, the riser got longer. This meant that while Mathews bows were getting quieter, they were also becoming a bit heavier. Matt McPherson realized this needed to be changed. The Ultra Light, introduced in 1995, was a tremendous hit with bow hunters across the nation. At 3 ½ pounds and shooting 300 fps, this innovative design quickly ushered in the demand for shorter, lighter, and faster bows. What made the Ultra Light’s weight even more remarkable was the fact that the bow featured a longer riser than other bows on the market.

Careful engineering is what made the long riser/light weight combination possible. This meant that risers could be made longer, which added more shooting stability, while still keeping overall bow-weight to a minimum.

In 2010, Mathews introduced the distinctively looking Grid Lock riser on the Z7; the first member of the Mathews Z-Series bows. This new riser design was not only structurally stronger than previous efforts, it was substantially lighter.

For 2012, the riser will be lightened even more. Overall, the “Geo Grid” riser will weigh less than the previous Grid Lock riser while still maintaining its strength. In addition, other components have been trimmed down in order to give bow hunters the lightest rig possible. These include the Reverse Assist Roller Guard, the Dead End String Stop, and the Harmonic Stabilizer Lite; which, like the standard Harmonic Stabilizer, absorbs 75 % of residual vibration, but now does so at 1/3 the weight (nearly 70% lighter).

 

Pioneers in the Industry

In 1991, Matt McPherson invented single cam technology and revolutionized the archery industry. Since then, it’s been a fast and furious stream of innovations that have brought the modern compound bow to where it is today. Year after year, our pioneered and patented technology improves bow performance and sets new industry standards. If you’re looking for the most advanced, most efficient, most accurate and most powerful bows on the market, look no further.

Zero T™

Zero-T

The Zero T Axle is designed to eliminate any excess space in the cam axle assembly. In standard axle set-ups unnecessary space between the limb tip components can result in inconsistent shot placement. Our Zero-T (Tolerance) Axle provides consistent component location resulting in enhanced shooting accuracy.

Geo Grid Lock™ riser

The Hēlim™ integrates the Grid Lock pattern in an advanced geometric design called Geo Grid Lock™. This technological breakthrough creates an ultra-rigid lightweight riser, making the Hēlim one of the industry’s lightest hunting bows.

Hēlim Cam

In 1992 Matt McPherson introduced the revolutionary concept of single-cam technology. His innovation changed archery forever! How? Timing and synchronization issues became history. As a result, accuracy improved, and recoil and noise nearly vanished. – The Hēlimcam culminates 20 years of single-cam advancements.

Harmonic Stabilizer Lite

The Harmonic Stabilizer™ is another exciting innovation from Mathews Inc. The Harmonic Stabilizer™ will give optimum performance and dampen more than 75% of residual vibration!

Grid Lock Riser


In addition to looking cool, the Grid Lock Riser creates a lighter yet structurally stronger riser

Reverse Assist Guard

The Reverse Assist™ Roller Guard reduces friction for a smoother draw cycle by positioning cables in a reverse manner; in front rather than behind the roller guard. Traditional roller guards position cables on the back side of the roller guard and cause the cables to wrap tighter as the bow is drawn back and therefore places more pressure on the cables. The Reverse Assist™ Roller Guard allows the cable to roll with less tension in a fully contained roller guard and ultimately makes the bow smoother since there is less tension on the cable.

Draw back your current bow and compare it to the Mathews Z7, set at the same draw weight, and you will quickly see how the Reverse Assist™ Roller Guard ‘assists’ you in drawing back!

Focus Grip featuring Focus Ridge

The new Focus Grip with patent pending Focus Ridge helps minimize hand torque in the event of poor hand placement by keeping pressure concentrated in the center of the grip, unlike typical flat top grips that move pressure to the outside edge which increases hand torque. It does this with a slightly higher portion of the grip which contacts the pressure point of the hand. This doesn’t allow the rest of the hand to come in contact with the grip; thus eliminating torque caused by poor hand placement.

Monkey Tails

Eliminate string and cable sound and vibration. This string accessory comes standard on the Mathews Z7! Four Monkey Tails™ equates to a minimal speed loss of 1-2 fps total with virtually all string and cable sound and vibration eliminated.

Retrofit older Mathews Models – Monkey Tails™ will be available for purchase at your nearest Authorized Mathews Retailer

Dead End String Stop

New for 2009, Mathews introduces the Dead End™ String Stop™ by Arrow Web®. The Dead End™ String Stop™ drastically reduces residual vibration and virtually eliminates post-release noise! Installs in minutes and fits most bows currently equipped with a rear stabilizer bushing. Feel the Dead End™ difference today at your local Mathews Retailer!

Advanced Vectoring Cam

AVS LogoIn any cam system the forces that the cables exert on the cam are actually vectors. Vector is an engineering term which indicates that these forces have both direction and magnitude. While the magnitude of the force exerted by the power / buss cable increases as the bow is drawn, the direction of that force (in all previous designs) has been mainly determined by the distance between the centerline of the axle and the cable’s contact point on the take-up track of the cam. At no time since the conception of the compound bow has the anchor cable force vector been able to traverse from one side of the cam axle to the other. Mathews realized that this same limitation had been imposed on all of the previous compounding systems. The result of that realization was the introduction of another industry first, The Advanced Power Cable Vectoring System (AVS).


The new AVS system allowed Mathews to dynamically move the force vector of the anchored cable from one side of the cam axle to the complete other side of the axle. This gave engineers the ability to optimize draw force profiles for energy storage, maximum bow performance and efficiency. The result was that Mathews built the fastest and highest performing dual-cam bows in the archery industry. The new Advanced Vectoring System also allows Mathews Inc. to create the fastest, most efficient compound bows ever produced. The McPherson Series Monster and Monster XLR8 quickly proved that point; while at the same time maintaining 80% Let Off. All of which adds validity to the Mathews phrase “Catch us if You Can”.

Quad Vlock Limbs

Locking mechanisms on typical limbs merely set the limb in the adjoining limb pocket or attach the limb to the riser by a screw. The VLOCK limb system; however, takes the end of the limb; which resembles a V, and pushes the limb into the VLOCK area so that the end of the limb is perfectly aligned every time under pressure. The quad limbs also feature a reverse locking mechanism that keeps the limbs securely locked in place. This double-locking limb system locks the limb securely into a zero tolerance position.

Today’s bows have gotten so parallel that some bow presses actually can strain the limb and pull on the socket. The reverse lock prevents this from happening making the most durable marriage of both limb and riser.

The QUAD VLock is found on on the Mcpherson Series Monster Bows.

Harmonic Stabilizer

The Harmonic Stabilizer was designed to fit into the bottom Harmonic Damper hole and eliminate excess vibration and noise created by high speed bows. One Harmonic Stabilizer makes a smooth-shooting Mathews even smoother and reduces up to 75% more residual vibration!

Watch and see what Tom Miranda, host of Whitetail Country and Territories Wild, has to say about the Harmonic Stabilizer and why it’s a great addition to an existing Mathews model.

String Grubs

String Grub
String Grubs aid in reducing string vibration in order to gain more speed. The String Grub is an important component in this fully integrated system that makes the Reezen the fastest most efficient single cam bow in the world and the Monster the fastest, most efficient twin cam in the world.

DownForce Arrow Rest

Unlike other conventional drop away rests, the triggering cable on the DownForce attaches to the lower half of the bowstring, not the cable. This means the cradle stays with the arrow longer to provide the ultimate amount of guidance during release. The power retract mechanism pulls away ultra-fast, up to 5 times faster than previous models, providing maximum fletching clearance, and a straighter, more accurate arrow flight.

Lost Camo
Get Lost, or Be Found

Lost Camo was developed by Mathews founder, Matt McPherson and team. It has a distinctive horizontal look that is designed to get lost in the trees above… precisely where you will be with your new Mathews Z7 Xtreme! Lost Camo is equally effective in all kinds of terrain, western draws, fence lines, rocky hillsides, or the Texas brush. The colors in Lost Camo are found everywhere in the country, 12 months of the year. The Lost Camo pattern is larger than most patterns on the market, which means it will stay effective even at long distances. Designed by a bowhunter, for bowhunters, Lost is the perfect addition to any bowhunters gearbag.

Lost Camo is one of the largest camo patterns on the market designed specifically for bowhunters.

The average camo pattern is composed of 25” x 25” frames, whereas Lost Camo frames are 60” x 40”. This ensures that the garments are never perceived as a solid color, even at 1000 yards. The unique pattern has shelf appeal and optimal functionality for bowhunters.

Mission Archery is born

Mission Archery was born out of the need for a high quality pro-shop bow that had speed, accuracy and plenty of innovations that was affordable. The Mission line quickly became popular with pro shops and bowhunters looking for a high quality bow without a high-end price tag.

ArrowWeb T-Series Quiver

With the Spider Claw Quick Twist System, this simple yet functional quiver design becomes an instant hit with Mathews fans. It is extremely light, can be detached and attached to the bow in seconds without loosening any bolts and looks like it belongs on the bow instead of looking like a bulky accessory.

A quiver is a quiver, right? Wrong! Mathews revolutionary new ArrowWeb T-series quivers are unlike any others on the market. Loaded with innovative features including the SpiderClaw quick snap attachment system, the T-Series line of quivers are extremely lightweight. Mounting on the upper portion of the riser, the T-series quiver places your arrows higher up on the bow; above the lower cam. Traditional quivers typically mount over the top of the bow sight; placing the arrows lower; past the lower cam where the nock-end can be more easily damaged.

SE Composite SlimbLimb

Not only has the geometry of the Mathews bow limbs changed, the material used to make them continues to progress. Mathews revolutionary SE5 Composite SlimLimbs represent yet another industry first. Thanks to our proprietary SE5 Composite material, the limbs on the latest Mathews are dramatically thinner, yet subsequently more durable. SE SlimLimbs are 30% lighter, yet nearly twice as strong. Cycle tests show that SlimbLimbs last twice as long as many conventional limbs.The SphereLock Pivoting Limb Lock System, unveiled in 2007, is another Mathews original that ensures the limb is locked into place with zero play during the draw process. Combined with the Limb Turret, the load gets spread out while cradling the limb at the same time, creating a super tough and tight limb to riser connection; thus dramatically increasing overall accuracy.

Spherelock Pivot System

This unique design is another Mathews original that ensures the limb is locked into place with zero play while being drawn. Combined with the Limb Turret, the load gets spread out while cradling the limb at the same time, creating a super tough and tight limb to riser connection

SlimFit Inline Grip

The wood inlay found going down the center of every Mathews wooden bow grip establishes the centerline which makes finding center-shot and setting up a rest easier than ever before.

Made of rich walnut the Mathews SlimFit Inline grip includes a wood inlay found going down the center of the grip. This establishes the centerline of the grip and makes finding center-shot and setting up a rest easier than ever before.

Personalize Your Grip With Custom Engraving!

V-Lock Limb Cup System

The “V-LOCK”™ limb cup system forces the bow limb into positive and consistent alignment where it is attached to the bow handle. The result is consistent bow performance in terms of accuracy and an increased confidence level of the archer which puts more trophies on the wall and more Mathews pros on the podium.

Angled Roller Guard

With the introduction of the Angled Roller, bows become noticeably smoother and easier to draw. The roller guard creates less friction than a conventional roller guard which in turn makes the bow more efficient.

String Suppressors

String SuppressorsString Suppressors stop the forward motion of the string after the shot, quickly bringing them to a halt resulting in less noise and string slap. This is just another example of Matt Mcpherson’s determination to make bows as quiet and vibration free as possible.

Genesis Project Unveiled

McPherson said, “I’ve had guys ask me, ‘Is there a bow I can buy that my whole family can shoot. I’d have to say ‘No,’ but what I’m thinking is ‘Why not? Why don’t I design a compound bow that has no specific draw length, and have the weight so low that Dad can shoot it, Mom can shoot it, and the kids can shoot it.’”

The Genesis System eliminates let-off on light draw weight bows (where its unnecessary) so there are no specific draw length requirements. The result is a bow that fits virtually everyone (15″ to 30″) and that a young person can’t outgrow.

Harmonic Damping System

At the 2000 AMO Show, the show floor is buzzing about the Mathews new Harmonic Damping System. People line up at the Mathews Booth to see the new invention for themselves. Without question, the Harmonic Damping System, another brain child of Matt Mcpherson is one of the most recognized and effective accessories in the archery industry today. Upon its introduction to the market, consumers and other companies saw the many benefits of the system, which greatly reduces noise and vibration. Today the Harmonic Damping System is utilized in bow sights, rests, and even bicycle handles.


Watch and listen as Levi and Samantha Morgan demonstrate the differences between a bow riser with and without Harmonic Dampers.

When the bow launches an arrow, the greatest portion of the energy stored in the bow is transferred to the arrow. However, the residual energy must be absorbed by the bow system and the archer. Mathews’ Harmonic Dampers are designed into the bow system (on the upper and lower portion of the riser) and are tuned to absorb a significant portion of the residual energy while it is still in the bow, before it can reach the shooter. The results in a bow that is smoother and more pleasurable to shoot.

Perimeter Weighted Cam

At full draw, the Inertia Disc is poised to take a fast ride around the outside of the fully-cocked Mathews Cam. Like a rocket at take-off, momentum builds gradually because of the energy required to set the Inertia Disc in motion around the perimeter of the cam. A smooth take-off results in a smooth release. As the Cam quickly gathers speed, the Inertia Disc is catapulting in the opposite direction of the bow limbs, counteracting their momentum and resulting in dramatic reduction in overall bow recoil. The Inertia Disc® has gained tremendous centrifugal momentum that substantially lengthens and strengthens the cam’s power stroke, resulting in arrow speeds never before achieved from one-cam or two cam bows in this era!

Straightline, Zero Feed Cam

Mathews introduced the MQ1, the first dual-feed single cam bow with straight nocking point travel. Its’ cam, the StraightLine MaxCam™ created more consistent nock travel which made the bow extremely accurate.

Read MQ1 High Grade Bow Review by Bow & Arrow’s Joe Bell

High Efficiency High Speed

Up until this point, the only remaining advantage of a two-cam system was speed. Not anymore! Mathews, the inventor of single-cam technology, has developed a revolutionary new single-cam that is faster than any two cam system in this era! With a strategically placed tungsten carbide weight (Inertia Disc®) on the perimeter of the new Mathews Max Cam®, this “perimeter weighting” creates a “flywheel effect” that lengthens and strengthens the cam’s power stroke, which dramatically increases the arrow speed while also reducing recoil.

Max Cam: Speed without the Kick!

Parallel Limb Design

The Parallel limb design is another Mathews first. In 1996, Mathews introduced the Signature, a bow with a longer riser and shorter, more parallel limbs. Since then, Mathews bows have featured limbs that have gotten progressively more parallel. Parallel-limb bows are quieter and more vibration-free than previous designs. With parallel limbs, vibration and noise are cancelled out, making the bow quieter and nearly shock free. Parallel limbs not only make for a smooth shooting, whisper quiet bow, they also increase speeds and efficiencies.

Today, the limbs on Mathews bows have gone beyond Parallel, resulting in an even longer riser and therefore increased stability.

Dual Feed Single Cam

In the fall of 1995, Mathews introduced the Feather Light. It featured the ProCam, the first single cam with even tiller.

Carbon Cable Guard

Mathews introduced the first carbon cable guard. It didn’t squeak in wet conditions like metal cable guards and was significantly lighter and stiffer, making for an all around better performing cable guard. It wasn’t long after competitors followed suit with their versions of Mathews’ pioneered carbon cable technology.

Zebra ZS Twist BowString

The unique and innovative Zebra ZS Twist Bowstring was created by twisting two separate string bundles in opposing directions of each other, helping to balance the complete bowstring.This minimized string rotation, reducing peep sight alignment problems. Proprietary technologies and processes account for virtually no stretching issues and increase durability compared to other strings. After they were introduced, they quickly turned an item that very few people thought about into a major bow accessory. Consumers started requesting the Zebra string by name.

Today, Zebra Bowstrings are trusted by top Professional archers and have won over $8,000,000 in tournament victories… far more than any other string!


Using a proprietary manufacturing process, Mathews has had a long history of making premium bowstrings. The latest addition is the Mathews Genuine Bowstring & Cable. The Mathews Genuine Bowstring is the highest performing bowstring in the world, not only in the field but also on the target line. Mathews Genuine Bowstrings & Cables are designed and manufactured to precise standards which optimize performance and provide perfect fit, finish and quality to your Mathews bow. Furthermore, Mathews Genuine Bowstrings are taken through an extensive and unique pre-stretching process, eliminating creep before the string is placed on a bow. This ensures that a Mathews bow will not suffer the same fate as other bow systems once their string stretches past its original dimensions. You’ll find Mathews innovation and experience excellence in every shot.

Single Cam Technology

This is the heart and soul of Mathews. With the desire to build a better system, Matt McPherson developed the single-cam and forever changed the landscape of bow design. In the same year as its inception (1992), the solo cam was proclaimed to be “the greatest innovation of the nineties!” by Petersen’s Bowhunting’s Greg Tinsley.
The reason the solo cam become such a phenomenal success and quickly became the industry standard was that it effectively addressed and solved the inherent problems of the two-cam bow system.
Think of the single-cam as an individual runner, verses a two cam bow represented as two runners, participating in a three-legged race. Unless the two runners are in perfect sync, which they typically never are, the single runner will always win.

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Likewise, the two cams are almost never in perfect synch which causes sharp deviation in the nock point travel path (affecting arrow speed and accuracy) as well as making the bow noisier and more difficult to tune. With just one cam to “fire,” a single cam bow can’t go out of synch and you never have to worry about inconsistent shooting. In addition, they have fewer variables. Therefore, there are fewer things that can go wrong on a single-cam bow. Because of that, they are naturally more dependable.
Over the years, advancements in the solo cam have improved performance, accuracy and overall shooting pleasure. In the fall of 1995, Mathews introduced the Feather Light. It featured the ProCam; the first ever dual-feed single cam with even tiller. The advantages of this design were quickly realized by tournament shooters who suddenly found themselves switching to the single-cam design in an effort to stay competitive on the pro circuit.
In addition to the many benefit’s the single-cam offered, Mathews realized the need to provide its shooters with something more….speed. Faster than any two cam system in its era, the Mathews Max Cam, introduced in 1997, set a new standard when it came to single-cam bow speed. The secret behind its success was a strategically placed tungsten carbide weight (Inertia Disc) on the perimeter of the cam. This “perimeter weighting” created a “flywheel effect” that lengthened and strengthened the cam’s power stroke, which dramatically increased arrow speed while at the same time reducing recoil. This meant Mathews shooters could experience increased arrow velocity without the “kick” most other cam systems generated.
The Max Cam spawned additional cam designs; each of which incorporated Perimeter Weighted Technology. At full draw, the Inertia Disc within the cam is ready to take a fast ride around the outside of the fully-cocked Mathews Cam. Upon take-off, momentum builds gradually because of the energy required to set the Inertia Disc in motion around the perimeter of the cam. This smooth take-off results in a smooth release which greatly enhances accuracy. As the cam quickly gathers speed, the Inertia Disc is catapulted in the opposite direction of the bow limbs, counteracting their momentum and resulting in dramatic reduction in overall bow recoil. Less recoil means less noise. By the end of the cam rotation, the Inertia Disc has gained tremendous centrifugal momentum that substantially lengthens and strengthens the cam’s power stroke, resulting in arrow speeds never before achieved from one-cam or two cam bows in this era.
In an effort to make a fast bow that was also accurate, Mathews designed the MQ1StraightLine, Dual Feed Single Cam in 1998. This was the first dual-feed single cam bow with straight nocking point travel. As a result, the StraightLine MaxCam created more consistent nock travel which made the bow extremely accurate.
In 2009, Mathews brought to market the Reezen. Thanks to a multitude of Mathews innovations, the new Reezen produced the highest efficiencies at the fastest speeds ever tested from a single-cam bow. With speeds up to 340 feet per second at 80% let off, it was not only accurate, forgiving and smooth drawing, but deadly fast.
For 2012, Mathews has taken a culmination of over 20 years of cam design and developed it into the all new Hēlim Cam.

One Cam Vs. Two

Think of the one cam as an individual runner verses a two cam bow as two runners participating in a three-legged race. Unless the two runners are in perfect sync, which they typically never are, the single runner will always win.

Likewise, the two cams are almost never in perfect synch which causes sharp deviation in the nock point travel path (affecting arrow speed and accuracy) as well as making the bow noisier and more difficult to tune.

With just one cam to “fire,” a single cam bow can’t go out of synch. You won’t have to worry about inconsistent shooting.

High Let Off Revolution

Matt McPherson, Founder and CEO, started making recurve and compound bows beginning in the 1970’s. Many designs and years later, McPherson decided to take one of his newest innovations, the Inner Cam (patent filed in approximately 1985) and started McPherson Archery. The company was later sold in 1989.

The McPherson Brand paved the way for the High Let-off Revolution. Bows were taken from an average of 50% let-off to a remarkable 75%, making it easier for archers to draw and hold more weight.