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Product Specifications


18 Gauge / 1.18mm


40 feet / 12.2 meters


1 Package.

Item #


Style #


Item is returnable, but does not qualify for free returns.

Tecnifibre X-One Biphase 18

Tecnifibre X-One Biphase 18 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 18 gauge is even thinner for increased feel on more precise touch shots.

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