Cool white string, add style and function to your racquet. The Yonex REXIS tennis string combines exceptional comfort, feel, and ball-pocketing with a stylish cool white finish. Designed for players of all swing speeds seeking a softer, more comfortable response, REXIS features innovative FRF (Fusion of Resin Filament) technology, which fills the gaps between nylon filaments with flexible FORTIMO material to enhance elasticity and power. An advanced Plasma Bonding process bonds resin to the nylon filaments at the molecular level, improving repulsion and durability for a responsive, comfortable playing experience.