Tecnifibre X-One Biphase 17 is Tecnifibre's flagship playability tennis string. and for good reason. With plenty of technology packed in for maximum power. feel and comfort. this string is even a great choice if you suffer from arm pain. The 17 gauge is even thinner for increased feel on those touch shots.

• Biphase process offers 20% increased durability.
• Multifilament Synthetic string.