The Tecnifibre X-One Biphase 1.24 tennis string is ideal for players looking for superior durability, power & control. It provides good tension maintenance & a gut-like feel. This multifilament sting is constructed from High Heat Capacity (H2C) fibres that deliver superb feel & power, & Polyurethane fibres that minimize shock & improve comfort. The string utilises the new Biphase process that increases durability by up to 20%. The Tecnifibre X-One Biphase has a 17 (1.24mm) gauge & is available in a 200m (656ft.) reel.