The BLACK CODE string is the most flexible in this range with a pentagonal construction that allows a lot of spin. Leading brand in strings, Tecnifibre offers a wide range of strings dedicated to all levels and requirements of players. This string has been designed: For the very good player demanding in search of resistance and flexibility For rackets over 300g For big string breakers Black color Main material: Co-polyester Recommended tension between 22 and 25 kg Maximum tension: 32 kg Recommended for big string breakers (>10 hours of play) String made in France. Thermocore: Guarantees the greatest flexibility for polyester monofilaments to generate less fatigue. Co-Polyester Flex Compound: Selection of polyester granules known for their maximum flexibility. High quality material thanks to a mix of different polyesters. Section: Pentagonal (5 faces) to increase the effect WORLD BEST SELLER It brings it all! Power, spin, and flexibility. PLAYER FEEDBACK Dedicated to a very wide range of players. The pure Tecnifibre signature: performance & physical integrity.