Yonex BG66 Ultimax is a thin gauge (0.65mm) high intensity multifilament string offering the perfect balance of maximum speed, control and durability, making it the best choice for the worlds top players.

Constructed with a high-intensity nylon core which gives 30% greater durability than normal nylon together with a high-polymer outer which provides sharp feeling and high repulsion - exceptional all-round performance from an extra fine string.

The high-intensity nylon core gives 30% greater durability than normal nylon while a high-polymer nylon outer provides sharp feeling and high repulsion - exceptional all-round performance from an extra-fine string. "The sound from the BG66UM string is great. Every shot feels so strong and powerful" Taufik Hidayat (INA)