Description: Box-shaped for power. Aerodynamic for speed. Strong forehand smash. Fast backhand drive. Item Code: DUO10 Flex: Stiff Frame: H.M. Graphite, NANOMETRIC DR, Ni-Ti Fiber Shaft: H.M. Graphite, NANOMETRIC Weight / Grip Size: 3U (Ave.88g) G4,5 2U (Ave.93g) G4,5 Stringing Advice: 3U 16-26 lbs, 2U 20-27 lbs