Tecnifibre X-1 Biphase 1.24mm 12.2m set Red

Tecnifibre X-One Biphase 1.24mm 12.2m Set Red Tennis String

The Tecnifibre X-One Biphase 1.24mm 12.2m Set Red is a premium multifilament tennis string designed for advanced and demanding players who prioritize exceptional comfort, feel, power, and tension maintenance. Designed to deliver many of the performance benefits associated with natural gut while avoiding its sensitivity to humidity and offering improved durability, X-One Biphase is one of Tecnifibre's flagship multifilament strings.

Built with more than 1,400 technical filaments, X-One Biphase combines 50% Elastyl® fibers for maximum power with 50% H²C fibers for improved tension resistance. The filaments are impregnated with PU 400 polyurethane, Tecnifibre's highest elasticity grade of polyurethane for racket sports, creating an exceptionally comfortable and powerful response.

Over 1,400 Filaments – Premium Multifilament Feel

X-One Biphase uses more than 1,400 individual filaments to recreate the soft, responsive feel associated with natural gut. The sophisticated multifilament construction provides excellent comfort and feel while delivering the powerful response demanded by advanced players.

Elastyl® Fibers – Maximum Power

50% Elastyl® fibers are incorporated into the string construction to maximize power. These technical fibers help create an energetic response at impact, allowing players to generate depth and pace without needing to rely solely on their own swing power.

H²C Fibers – Tension Resistance

50% H²C fibers provide enhanced tension resistance, helping the string maintain its playing characteristics for longer. This contributes to the consistent response and durability expected from a premium multifilament string.

Biphase Technology – Superior Tension Retention

The unique Biphase manufacturing process uses an exclusive pre-stretching technique designed to improve tension retention. At the end of production, the string passes between two toothed wheels rotating in opposite directions, stretching the string along its entire length. This process helps the string retain its tension and creates the distinctive notching effect that gives X-One Biphase its unique visual appearance.

PU 400 – Exceptional Comfort & Elasticity

The technical filaments are impregnated throughout with PU 400 liquid polyurethane. PU 400 is Tecnifibre's highest elasticity grade of polyurethane used in racket sports, offering up to 400% elasticity. This construction provides exceptional comfort, feel, and power while helping the string maintain its premium multifilament characteristics.

SPL Coating – Snap-Back & Spin

The string is finished with a slippery agent known as SPL, which helps facilitate the automatic return of the strings after ball impact. This snap-back effect supports spin generation while contributing to the smooth response of the multifilament construction.

Natural Gut-Like Performance

X-One Biphase is designed to provide many of the comfort, feel, and power benefits associated with natural gut while offering greater resistance to humidity and improved durability. This makes it a compelling alternative for players who want premium multifilament performance without some of the drawbacks of natural gut.

Designed for Demanding Players

The X-One Biphase is intended for good-level and advanced players who demand exceptional comfort, feel, and power from their string setup. Due to its premium multifilament construction, it is not recommended for players who frequently break strings, particularly those who typically break strings in less than 10 hours of play.

French Multifilament Expertise

TECNIFIBRE is renowned for its expertise in multifilament string technology, including the development of multifilaments impregnated throughout with liquid polyurethane. Designed, developed, and produced in France, Tecnifibre multifilament strings are engineered to deliver comfort, power, and consistent performance over time.

Key Features

• Premium multifilament tennis string designed for advanced players
• More than 1,400 technical filaments for exceptional comfort and feel
• 50% Elastyl® fibers provide maximum power
• 50% H²C fibers improve tension resistance
• PU 400 polyurethane provides exceptional elasticity, comfort, and power
• Exclusive Biphase pre-stretching process improves tension retention
• Distinctive notching effect creates a unique visual appearance
• SPL slippery coating supports string snap-back and spin generation
• Designed to provide natural gut-like comfort and feel
• More resistant to humidity than natural gut
• Red colourway
• 12.2 m / 12 m set suitable for one standard tennis racquet
• Recommended for players demanding comfort, feel, and power

Technical Specifications

• Product: Tecnifibre X-One Biphase Tennis String
• Range: X-One Biphase
• Gauge: 1.24 mm
• Length: 12.2 m / 12 m Set
• String Type: Multifilament
• Filaments: 1,400+ technical filaments
• Composition: 50% Elastyl® / 50% H²C Fibers
• Coating: PU 400 Polyurethane with SPL finish
• Technology: Biphase Pre-Stretching Process
• Colour: Red
• Recommended Tension: 22-25 kg
• Maximum Tension: 32 kg
• Packaging: 12 m Trim / Set
• Made: France

The Tecnifibre X-One Biphase 1.24mm 12.2m Set Red is a premium choice for players seeking outstanding comfort, feel, power, and tension retention. Its 1,400+ filament construction combines Elastyl® and H²C fibers, while PU 400 provides exceptional elasticity and comfort. The exclusive Biphase pre-stretching process helps maintain tension, and the SPL finish promotes snap-back for additional spin potential. Designed for demanding players who value premium multifilament performance, X-One Biphase delivers a refined combination of natural gut-like playability and modern string durability.