According to the "Tennis Warehouse" (commercial) website (refer to the link, below), "natural gut" is made predominantly from cow intenstines, though sheep intestines were used early on. Since natural gut is very expensive, most players use strings made from artificial materials, such as nylon and other composite materials. Regardless of the source, the process to make strings is basically the same: The material is formed into a single strand via extrusion under heat and pressure, until it meets the requirements of the manufacturer for temperature, tension or torsion, density, gauge (thickness), etc. The string may be colored or left as is (i.e., "natural"). The manufacture will also stamp or laser imprint information about the string on the string itself; often it is so small, that most people aren't aware that it's there. The strands may be cut and packaged into "sets" (i.e., individual packets to string a single racquet, usually 40 feet in length) or "reels" (i.e., a single strand many yards in length which is meant to be cut for individual racquets, usually by a professional stringer). For further information, click on the Wikipedia link, below.
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The most durable string is made of kevlar, a synthetic fiber. Strings are also made of natural gut that comes from the intestines of a cow, synthetic gut which is a nylon fiber, and polyester.
Natural Gut, Polyester, Nylon, Kevlar,multifiliment,synthetic gut
there is no "best" type of string because it is what ever best suits your game for example I use a all poly or a hybrid(2 different kinds of string at one time on a racket) because I hit with a lot of spin and brake string a lot.
String is made of four basic materials: (1) natural gut-- made form beef intestines (most commonly used material in natural gut) (2) nylon--commonly referred to as synthetic gut. This also covers such terms as multifilament or multifiber (3) Kevlar--also used to produce bullet proof clothing and considered to be one of the most durable of strings but not the most comfortable to play with (4) Polyester -- technically referred to as co-polymer strings. Polyester strings has consistently become the most popular string on the professional tennis tour in the 21st century. On the ATP and WTA tours, natural gut was the most popular string for many, many years. With new technology there are more and more variations of synthetic string available and co-polymer strings are constantly being improved to be more "player friendly". Today, many players are using hybrid string jobs in their racquets. Hybrids consist of different strings in the main (vertical) and cross (horizontal) strings. These can be a mix of various string types or the exact same string material in two different gauges (thicknesses). Still, no man-made string has properties equal to natural gut with regards to how the string responds at tensions between 50-70 lbs, the tesnion range most commonly used in tennis.