The RAZOR CODE string is the most resistant and hardest to deform in this range with a composition that allows a lot of control. Tecnifibre is the leading brand in stringing and offers a wide range of strings dedicated to all levels and requirements of players. This string has been designed : For the very good and demanding player looking for resistance and versatility For rackets over 300g Recommended for heavy string breakers Main material: Co-polyester Recommended tension between 22 and 25 kg Maximum tension: 32 kgs Recommended for heavy string breakers (> 10 hours of play) String made in France. Thermocore: Guarantees the greatest flexibility for polyester monofilaments to generate less fatigue. High Modulus Polyester Compound: Provides a firm feel and extreme durability Section: Round for versatility. BEST SELLER FOR GOOD PLAYERS A real plus for the heavy hitters. PLAYER'S FEEDBACK The strongest and firmest string but still more flexible than the Blast or the 4G.