The Wilson Rip Spin tennis string set has a length of 12.2m (40ft) that is enough to re-string one racket. The string has a gauge of 17 (1.25mm) & incorporates a monofilament core ensuring tension retention & extra durability. It is designed to generate maximum spin, which has been achieved due to proprietary UHMW coating that enables free movement of strings & allows them to snap back quickly.