The Li-Ning Rocks 520 badminton racket utilises ultra-stiff carbon fibres which provide optimum rigidity & strength allowing for higher string tension that prevents frame deformation. The racket weighs only 85-89g & utilises a 7.0mm top slim shaft design which offers extreme strength & easier control along with good stability. in addition, the head light balance of the racket contributes to its excellent control, while the extremely low drag coefficient allows for excellent performance on various shots.