Mizuno PROTOTYPE X-3D Badminton Racket (Unstrung)Always at the forefront of innovation, the Prototype X 3D racket features key technological elements that gives a player the needed edge from converting a good shot into a great one. Specifications Length: 675mm Weight Size: 4U5 (81 85g) Flex: Medium Balance: Head Heavy Head Light Max Tension: 30 lbs Material: Japan HMG T40 Technologies Diamond V Frame The precision engineered Diamond designs on the frame reduces any structural warping of the racket