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.