Babolat RPM Blast 17 Tennis String 24110117 It 's the winning choice for Rafael Nadal, Jo-Wilfried Tsonga and Samantha Stosur. The right string for players who want more control and incredible spin! Packed with the latest technologies, this high-density co-polyester monofilament string offers a totally unique feel and a powerful, ultra-high-speed response. The octagonal section and cross-linked silicone coating allow the strings to quickly return to their original positions and "bite " the ball better for maximum spin. Babolat RPM Blast 17 Tennis String | Black | Christy Sports