The BLACK CODE string is the most flexible in this range with a pentagonal construction that allows a lot of spin. Tecnifibre is the leading brand in strings 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 flexibility For rackets over 300g For the heavy string breaker Colour: black 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. 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 sides) to increase the effect BEST SELLER WORLDWIDE It brings everything! Power, spin and flexibility. GAME RETURNS Dedicated to a very wide spectrum of players. Pure Tecnifibre signature: performance & physical integrity.