Yonex Nanoscience achieves precise control over racquet functions at the molecular level.It establishes a high-performance molecular bond of the fullerene and carbon nano-particles, creating an ultra-lightweight racquet that's thinner,stronger and more stable than an ordinary racquet for maximum power and speed from swing energy.● X-FULLERENE: X-Fullerene is used in the resin which bonds the Carbon fibres and creating the cross-link construction.The tenfold increase in binding force makes it possible to create 5% higher and 15% greater stability.● NEW GROMMET SYSTEM:Features: Size 4UG5Brand YONEXGrip Size 4 inchesSport Type BadmintonMaterial GraphiteFrame Material GraphiteShaft Material GraphiteAge Range (Description) Adult