The story of PACIFIC natural gut tennis racquet string
Why PACIFIC natural gut tennis racquet string is so good
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PACIFIC natural gut tennis racquet string
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What makes natural gut string so good?


There is no single factor that makes it stand out, in fact you can get better individual characteristics from a variety of materials. It is how well it melds them all together that makes it special.

  • Power

The elastic characteristic of natural gut allow it to react to the impact of the ball in such a way that it returns almost all of its energy in the form of velocity. This energy efficiency allows you to swing easier, and hit harder.

  • Feel

Perhaps my favorite story comes from one of the all time great tennis players. When asked why he played our natural gut he answered, “its feel is so sensitive that I can almost read the name on the ball through the string.” Feel and sound are two very nebulous qualities, yet they are among the most important factors top players use in determining what string to play. Gut offers sensitivity and a method of communication that makes you feel the racquet is a part of your arm. These characteristics are a major part of the feed back mechanism skilled players use to monitor their game and they are critical to maximum performance.

  • Control

Natural gut gives the impression of loading up slowly, and accelerating the ball smoothly. Players say the ball stays on the racquet longer. Some report that it “cups” the ball better. Its added power allows you to get all of the ball velocity you want out of a smooth, comfortable, natural swing. This combination of characteristics, added to natural gut’s ability to “bite” into the ball provide excellent control, are what makes it special.

  • Comfort

If you love to play a sport, time permitting you will play it a lot. As every athlete knows this will leave you vulnerable to overuse injuries. We all realize that hitting a tennis ball takes a toll on our bodies, sometimes this is simply fatigue, and sometimes it is more serious. The gentile way natural gut absorbs the impact of the racquet with the ball combined with the controlled way it returns that energy is our secret. By smoothing out the shocks your body must endure, fatigue is decreased tremendously. Judging from reports by players, arm and shoulder injuries decrease significantly as well.

  • Performance life

Top players do not judge durability on how long it takes for a string to break. They watch how long it plays well. Natural gut has an internal structure that is very elastic. This allows it to endure a tremendous number of impacts without fatiguing. While synthetics rarely break, they fatigue rapidly. Performance oriented players will normally cut out several sets of synthetic during the effective life of a single set of gut.

  • Economy

If performance is what you are after, consider this point. When even an inexpensive string will cost $25 or more including the cost of stringing, how many sets can you cut out before you pass the cost of natural gut? On a per hit basis, gut is actually a better buy than lower priced strings for most people.

How durable is natural gut?

There are two types of durability we should talk about; resistance to breakage, and performance life. Most synthetic strings are very tough, have a very high tensile strength, and normally are significantly more break resistant. However, gut has a different set of elasticity characteristics, which makes it resist fatigue much better. Typically, natural gut has a much longer performance life, in fact they usually play well up to the time they break. Synthetic gut strings will normally lose performance very rapidly, but will stay in the racquet without breakage for a very long time. One Pro summed it up very well, he said, “Gut has the integrity to retire before its game starts to suffer."

How do natural guts differ?

The quality of their raw materials, the number of plies and how many twists, plus the quality of their internal bonding, the amount of damage that was done by chemical processing, the type of coating, and physical properties like resilience, tensile strength and abrasion resistance. In other words they can be as different as black and white. In the final analysis it boils down to performance and performance life. Through a combination of chemistry and physics we can make a nearly infinite number of compromises between power, durability, elasticity and tensile strength.

Our PACIFIC natural gut strings are designed with the philosophy that they should have very high performance that remains reasonably consistent throughout their playing life, while exhibiting good wear resistance. So far, this is the same as everyone else.

We also believe that the string technology has to change to keep pace with racquet technology and the needs of the player. Not too long ago we were looking for every conceivable way to gain more power. The fact that top players are stringing natural gut at 70 pounds and higher in order to maintain control told us that we may have gone too far. The string had to be more closely tuned to modern racquet technology in order to be useable. We think it is a better idea to design a string that can give the desired level of power and control at reasonable tensions. By doing this we have been able to improve ball feel, decrease shock to the player, decrease tension loss, and improve durability — all this while maintaining the power players want and need.

How do PACIFIC™ natural gut strings compare to the competition?

Our best competitor produces an excellent product with a somewhat different philosophy. They put their emphasis on power, we have aimed at consistent performance. When they are first strung, the racquet is extremely powerful, this rapidly settles down to a plateau of excellent playability, then into a fairly rapid performance decline. The high initial power leads many players to use very high string tensions in order to maintain control. We have chosen to forgo the extremely high initial performance for more uniform playability and longer performance life. By optimizing our power to today’s racquets we provide control at 55 to 60 pound string tensions. One is not better, just clearly different.

How does natural gut compare to synthetics?

Synthetic strings are made from a wide variety of materials with an even larger number of construction techniques. To answer this fully would take about 96,000 pages, and you probably are not that interested. The collagen triple helix gives natural gut a balance of characteristics that provide excellent feel, power and control while absorbing many of the shocks and vibrations that are often blamed for arm and shoulder problems. Synthetics can be engineered to excel in some, or even most of these characteristics, but to date none have it all. From the point of view of performance life, natural gut is a little like a Energizer™ bunny, it just keeps going and going and going — until it dies.

Tennis string bed area tension lossUnlike most synthetics, the collagen molecule creates very little internal friction in its elastic cycle. This is an indication that little “work” damage is done during play. You will recognize what this means if you have ever played a hard afternoon of tennis with a single racquet strung with a good nylon. Overtime you will find your shots simply don't have the zip they had earlier, you tend to blame your age and physical condition. You are probably right, but the string is also getting tired. Natural gut does not fatigue nearly as fast, nor does it tire you as much, who says beef has no health benefits?

As you can see on the chart, all strings lose tension after they have spent time in a racquet, and they lose it faster when played. Simply looking at this chart gives only part of the picture because string bed tension is only part of the story. It is also important to know how much elastic life is left in the string. A trained ear can often find this answer in the sound of the ball coming off the racquet, dead strings generally sound dead.

A stringer has another and more accurate way of coming to this answer when old strings are cut out of the racquet. Typically, strings which have performance life left in them will “snap back” and shorten when they are cut or broken. Dead strings will not. As a general rule, natural gut strings still have the ability to snap back a great deal when they break, nylon has a little, polyester has less still, and Kevlar™ has nearly none.Tennis string elastic rebound

When I asked a top professional who has played PACIFIC™ natural gut for his entire career how long natural gut lasted in his racquet, he said “until it breaks.” Because this was not the answer I was after, I came back with “when does Natural Gut play its best,” he answered, “the shot before it breaks.” While synthetics may not break, they do loose their elasticity, and when that goes so does their performance and playability.

Please understand that these charts are based on a compilation of data, and do not represent any one type or brand of string, they simply illustrate a point.

Why do I need it?

Natural gut not only provides superior playability, it is less fatiguing to play with. In the final analysis it will improve your game and make tennis more fun. About 75% of the ATP, the finest and tightest fisted professional players in the world, use natural gut — and most pay for it.

Does natural gut help reduce medical problems such as tennis elbow?

Natural gut definitely is less fatiguing to play with. Most players who use it say it is far easier on their body than synthetics. The medical profession and the press often voice this opinion as well. It must also be said that many people have long and happy careers using harsh feeling synthetics. While there is no proof that natural gut produces a health benefit, most of the people who use it do so because they believe it allows them to play injury free. Try it and see for yourself.

What string gauges are available?

Natural gut is available in a full variety of gauges. Because of it’s excellent feel and ball bite players often choose slightly heavier gauges than they would use in synthetics. Most recreational players use 15L or 16, high level players 16L or 17. Remember thinner gauges give higher performance and shorter life.

What racquet sports can benefit from natural gut?

Badminton and squash players benefit as much from natural gut as tennis players do. Badminton strings are very fine 2½ to 3½, Squash 7½ to 8½.

What about hybrid string sets??

In spite of its outstanding characteristics, natural gut is not all things to all people. Some want more durability, others finer gauges, still others want less liveliness. By putting one type of string in the mains and another in the crosses a tremendous amount of fine-tuning can be achieved. Natural gut and Kevlar™ — Kevlar™ is a very strong string with very little elasticity. Its strength allows it to be used in fine gauges that provide excellent ball bite. Unfortunately, it does not provide very good feel, and it is very hard on the player. Many top professionals use 1.10 or 1.20 mm Kevlar™ in the main strings and a slightly heavier natural gut in the crosses. The result is fine playing, and more durable, as well as more player friendly. We have had many very successful natural gut hybrids including soft nylons and Zyex™ strings. Cut some sets in half and experiment, you may love it.