Tennis String Database

How to read a string's specification

A string's material and construction tell you which family it belongs to, and the gauge tells you how thick it is. Those are the facts a maker publishes and the facts this table lists. How a string plays in your racquet also depends on the frame, the string pattern, the reference tension your stringer sets and how long the strings have been in, so treat the table as a way to identify and compare strings, not to rank them.

• Material uses the same categories as the String Tension AI app: polyester, multifilament, synthetic gut, natural gut, polyamide and hybrid sets. Our guide to tennis string types explains how each family behaves.
• Gauge is listed in millimetres as the maker publishes it. Labels such as 16 or 17 vary between brands, which is why the millimetre value matters; the string gauge guide covers the trade-offs.
• Tension guidance appears only where the maker publishes it. Tecnifibre prints a recommended range for many strings and Polyfibre states whether to string higher, lower or at your usual setting. Everything else shows "Not published", and your racquet's printed range still sets the limits.

One source per string: the manufacturer's own page

Every specification in this table was copied from the string maker's product page on the access date shown in the row, and each row quotes the text it came from. Nothing comes from retailer listings, player reviews or lab tests, and the table makes no claims about feel, spin, durability or tension maintenance. Where a page did not publish a value, the cell says so rather than guessing.

• Material categories. The category follows the maker's own description. Polyfibre lists some of its monofilaments as olefin-polymer or polyethylene; they are grouped with polyester because they are stiff monofilaments, and the construction column keeps the maker's wording. Gamma Gut is a synthetic multifilament despite its name.
• Gauges. Millimetre values are listed as published; makers round differently, so 1.30 mm from one brand and 1.30 mm from another may not be identical. Völkl publishes gauge numbers without millimetres, so those rows show no diameter.
• Tension guidance. Shown in lbs first with the maker's kg in brackets. It is a reference setting for the stringing machine, not a measurement of the finished stringbed. Check it against your racquet's published range.
• Regional pages. Prince specifications come from Prince's official Japanese site, which publishes material, construction and millimetre gauges for each string. Versions sold elsewhere can differ.

The pro string setups table links each string it can match to its row here. See our editorial and correction standards for how public data is checked and corrected.