This thick gauge of X-One Biphase provides comfort and power seekers with impressive levels of control and durability. 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 new 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.

Try this 15L gauge for extra durability and directional control. Comfort is outstanding for a thick gauge. 

• Gauge: 15L/1.35 mm
• Length: 40ft/12.2m
• Composition: Multifilament (Polyurethane - PU 400, H2C fibers, Biphasic treatment)
• Colour: Natural