The Yonex BG Aerosonic badminton racket string is the world's thinnest string & is designed for hard-hitters. The set is 10m (33ft) long & the multifilament string offers high repulsion to match your hard, attacking style. There's a medium level of feel & the gauge is 22 (0.61mm). It is made from high-intensity nylon multifilament & high polymer braided nylon for the best performance.