Tecnifibre Tennis String X-One Biphase - Natural - 1.24 - Multifilament

X-One Biphase is Tecnifibre's highest-performing multifilament string, designed to excel in playability, durability, and tension maintenance. It includes a built-in wear indicator that shows clear fraying at the impact zone, helping players restring before breakage.

As the leading brand in multifilament technology, Tecnifibre produces this premium string in France using advanced fibres and treatments that deliver exceptional power, comfort, and long-lasting performance.

Featuring Elastyl and H2C fibres for maximum elasticity and strength, along with the exclusive Biphase pre-stretch process, X-One Biphase offers enhanced durability and improved spin generation.

A worldwide best seller, it delivers natural-gut-like performance without the fragility.

• Wear indicator for safe and timely restringing
• Outstanding power, comfort, and long-term performance
• Not recommended for heavy string breakers
• Made in France
• Natural gut like feel and response

Who is the Tecnifibre X-One Biphase best suited for?

Multifilament strings are the go-to for players who prioritise arm-friendliness, comfort and a soft feel - especially players with tennis elbow, older players and flat-ball hitters. They play closest to natural gut at a fraction of the price.

What does the 1.24 mm (17 gauge) gauge mean?

The 1.24 mm (17 gauge) indicates the string's thickness. This is a medium gauge, balancing feel, spin and durability - a popular choice for all-round play.

What tension should I string it at?

The recommended tension range is 53-62 lbs (24-28 kg). Multifilaments and gut hold tension beautifully across a wide range - the higher end still stays comfortable.

How long will this string last?

Expect this string to last most players 20-30 hours of play, or around 1-2 months of regular use. Restring when you notice the stringbed going dead or losing tension.