Tecnifibre X-One Biphase 15L (1.34mm) 200m Tennis String Reel – Natural

X-One Biphase is a premium product from Tecnifibre that combines the best of all worlds. It is a string that offers the power and control of a poly string but without the stiffness. X-One Biphase is a multifilament at core. Coated with Polyurethane and H2C (High Heat Capacity) fibres, this string reacts better than monofilament (Poly or Synthetic gut) and launches the ball in similar fashion as a natural gut. The H2C treatment which also adds to the elasticity makes this string much more durable than common multifilaments.