The X-ONE BIPHASE string is the best performing in this range on the 3 criteria of playability, durability and integrity. The particularity of this range is to present a wear indicator, which allows the player to change the string before complete breakage. This indicator is manifested by the significant fraying of the rope at the point of impact of the ball. Leading rope brand, Tecnifibre has built its success on the design and production in France of the first multifilament ropes. These ropes are renowned and appreciated for their power, their comfort and their strong ability to maintain their qualities over time. Color: natural Main material: Polyamide, polyurethane, silicone finish Recommended tension between 22 and 25 kg Maximum tension: 32 kg Not recommended for heavy string breakers (< 10 hours of play). Rope made in France. PU 400: 400% elasticity for great comfort and dynamic performance. Elastyl® fibers (50%): 12% elasticity compared to standard PA. Provides enormous elasticity for maximum power. H²C fibers (50%): Maximizes performance with high temperature fibers for better tension resistance. Biphase process: Exclusive “pre stretch” process to provide better tension and lifespan. Visible and perceptible on the string, it increases spin. World best seller The performance of the tubular without the defects of the tubular.