The Wilson Rip Spin tennis string is designed with those players in mind who look for excellent spin & durability. Maximum spin can be generated due to proprietary UHMW coating that makes strings move freely & snap back quickly, whereas enhanced durability is ensured by a monofilament core. The string has a gauge of 15 (1.35mm) & is supplied as a 12.2m (40ft) long set that is enough to re-string one racket.