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The Complete Guide to Tennis Strings

Updated June 2026 - 8 min read

Your strings are the only part of your racquet that touches the ball. They affect power, spin, comfort, and control more than any other equipment choice. This guide covers everything you need to know.

The 5 Types of Tennis Strings

Natural Gut

Made from cow intestine fibers. The most comfortable, powerful, and tension-stable string available. Used by pros who need feel and arm protection. Expensive at around 40-55 dollars per set and less durable against heavy topspin.

Polyester (Co-Poly)

A stiff monofilament string and the tour standard for spin and control. Available in round and shaped profiles. Shaped versions with square, pentagon, or octagonal cross-sections grip the ball more for extra spin. Best for advanced players with fast swings. Harsh on the arm.

Multifilament

Hundreds of microfibers wrapped together to mimic natural gut at a lower price. Comfortable, powerful, and arm-friendly. The best choice for most recreational players.

Synthetic Gut

A basic nylon string with a solid core. Affordable at 6-10 dollars per set, balanced, and predictable. The best entry-level option. Most pre-strung racquets use synthetic gut.

Hybrid

Two different strings in the same racquet. Typically polyester mains for spin and control with natural gut or multifilament crosses for comfort and power. The most versatile setup available.

String Gauge (Thickness)

GaugeDiameterCharacteristics
15L (thickest)1.35mmMost durable, least feel, least spin
161.30mmGood balance of durability and performance
16L1.25mmPopular choice with more feel and spin than 16
171.20mmMore spin and feel, less durable
18 (thinnest)1.15mmMaximum feel and spin, breaks fastest

Thinner strings move more, creating more spin and better feel. Thicker strings last longer. Most players settle on 16 or 16L gauge.

How to Choose

The right string depends on your level, racquet, playing style, arm health, and priorities. Rather than trial and error which gets expensive at 15-50 dollars per restring, use a data-driven approach.

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