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Holabird Sports

String Types

Here you get an overview about materials and construction principles used in tennis string production.

Symbol Material Description
A Aramid High tenacity metallic fiber with low elasticity. This family includes Kevlar and Technora. Extremely high durability, mostly used as the main string in hybrid strings.
P Polyester Popular, reasonable material. Good resistance. Mostly monofilament construction.
CP Co-Polyester Polyester with various additives for improved elasticity and tension stability. Mostly monofilament construction.
PA Polyamide Classic, reasonable material, e.g. Nylon. Most frequently used material in tennis strings. High number of different constructions.
PE Polyethylene This polymer is rarely the main component of tennis strings. It is much softer and more resilient than polyester. Mostly monofilament construction.
PU Polyurethane Frequently used as a resin in high quality multifilament strings. Also used in outer coatings for improved wear resistance.
ZY Zyex Resistant mineral fiber with good playability. Quite expensive, thus rarely used in tennis strings.
NG Natural gut These strings are manufactured from cow intestines in a costly process. Still unmatched playability. The most expensive strings.

Basic constructions
Symbol Construction Example
MONO Monofilament. The string is made of one single thick fiber, mostly with a surface coating.
CW Solid central core (usually Polyamide) wrapped by one layer of thin filaments. Classic "tournament" construction, lowest price category.
CWW Solid central core (usually Polyamide) wrapped by two layers of thin filaments. Classic "synthetic gut" construction. Increased elasticity compared to CW, but usually higher price.
MF Multifilament construction. These strings consist of hundreds or thousands of microfilaments. Usually with one or more wrappings. Often polyurethane is used for impregnation. Depending on the material these strings provide great elasticity, but at a high price.
RIB Ribbon construction. Inspired by the structure of natural gut strings, ribbons instead of filaments are used to make this kind of string. The benefit is increased tension stability.
Additional features
Symbol Construction Example
S Structured or textured surface. Rough surface enhances spin through additional ball bite.
TIC Titanium coating for increased resistance.
TIF One or more Titanium fibers are incorporated into the string for increased durability and tension stability. Rare.  
HYB Hybrid string. Different strings for mains and crosses. Usually a durable string for the mains and a resilient string for the crosses.