Built to deliver maximum spin. Tecnifibre Black Code 4S 17 tennis string will help you send the ball exactly where you want it to go with a square-shaped section. A unique production process delivers shock absorption and a reduction in vibrations. The combination of Thermocore technology and high density polyester creates high flexibility and tension maintenance.

• PU multifilaments provide 22% less arm fatigue.
• Official string of the ATP World Tour™.