Yonex Voltric Force (Unstrung) Badminton Racket, Black Compact frame with tri-bumper for devastating Smash power Item Code: vt-f, flex: stiff, frame: H.M. Graphite/tungsten, shaft: H.M. Graphite, length: 10 mm long, weight/grip size: 4U (ave.83g) G4,5 Stringing advice: 4U 20-27lbs The stiff Structure at the top of the frame allows the head to flex in a Controlled way, holding shuttles on the string bed for longer. The thin sides also allow more flex in the frame transferring increased energy to the shuttle Voltric has weight at the top of the frame and at the joint area, providing great handling while maintaining head-heavy power. The thinner frame at the top and sides of the head help reduce Air resistance and further improve handling