Volkl Cyclone Tennis String Set, Color Black, Gauge 1.30mm

Sweatband

The Volkl Cyclone tennis string set features a special cog-shaped, monofilament design in order to achieve increased spin on each shot without blowing off control, durability and hindering the ball speed. It's a fantastic choice for players who want to take advantage of the spin potential to focus down opponents on the courts. The string is available in a 12m (40ft) set.

Amazon

Gear-Shaped Structure Provides Ultimate Spin without Compromising Control and Durability; Great for Heavy-Hitting Players; Type: Monofilament; Material: Soft Co-Polymer; Length: 12m (40ft);