Yonex ISO Muscle Power 3 Badminton Racket The Yonex ISO Muscle Power 3 construction gives players a badminton racket that gives maximum face stability to generate faster speed and increased power. The Muscle Power frame allows exceptionally close contact between frame and string, enhancing the transfer of energy into every shot. Flex: Medium Frame: Aluminium Full Carbon Graphite Shaft Weight: 90.0-94.9g Grip Size: G4 Level: Beginner Colour: Orange