Material
Natural gut
Natural Gut strings are made from animal intestines. They have the best feel and performance, limiting common tennis injuries such as tennis elbow. They are the most expensive type of string. They are most commonly used by touring professionals, as most recreational players find them impractical. They are easily damaged by water, humidity, and other environmental factors, which gives them a relatively short lifetime.
Nylon
Also called synthetic gut, Nylon strings offer fairly good feel and performance. They are fairly affordable and are used by most casual and recreational players. They come in different blends and constructions, offering a wide range of performance levels. They last longer than natural gut, but shorter than Polyester and Kevlar.
Polyester
Polyester strings are more durable than gut, but have lower performance. They also have less feel and power, making them difficult to use. They tend to lose tension quickly, so most users have them strung with a higher initial tension.
Kevlar
Kevlar strings are the most durable type available. They are very stiff and provide poor power, making them harder on the arm and wrist. They are usually strung with 10% less tension to compensate for the stiffness.
Construction
Mono
Monofilament strings are made of a single solid fiber. They usually have surface coatings for added durability.
CW
These strings are composed of a solid core covered with thin filaments. They are the cheapest type of construction and are commonly used in tournaments.
CWW
CWW strings have a solid core and two layers of filament. They are used in most synthetic gut strings. They are more durable and elastic than CW strings, but also more expensive.
MF (Multifilament)
These strings have cores made of several microfilaments with one or more coatings. They are used with several string materials, but mostly use polyurethane for impregnation. They usually offer more elasticity and are relatively expensive.
Ribbon
These strings are designed after natural gut, using ribbons instead of filaments. They provide more tension stability than other constructions.
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