Tennis Warehouse Exclusive!

X-One BiPhase is defined by its velvety comfort and easy power. This version comes in a black color, giving it slightly more control than the standard version. According to Tecnifibre, "the X-One Biphase string uses High Heat Capacity (H2C) fibers which allows the use of an innovative chemical treatment process called Trimerization. This new process increases the cohesion between chemical molecule links through extreme variations in temperature to result in ultimate dynamic efficiency (power) and exceptional feel. The patented Biphasic process, with its visible marks on the string, extends string life by 20% and offers increased spin. Similar to its leading string, NRG2, the multifilament fibers within this string are immersed in polyurethane to provide shock absorption and optimum comfort." This color update to one of the game's most iconic multifilaments checks all the right boxes. In addition to delivering maximum levels of comfort and outstanding tension maintenance, X-One BiPhase Black delivers the kind of controllable power that inspires confidence on full swings.

• Gauge: 17/1.24mm
• Length: 40ft/12.2m
• Composition: Multifilament (Polyurethane- PU 400, H2C fibers, Biphasic treatment)
• Color: Black