Yonex muscle power 5 badminton racket the yonex muscle power 5 badminton racket has a steel shaft and isometric head design which provides great control and an increased accuracy over shots the head has a thicker base making the racket move quickly through the air to provide more power while yonex branding completes the look badminton racket isometric head shape steel shaft construction grommets to bottom of head lightweight thicker head base yonex branding weight