Fidanza Performance Features: Heat Treated Friction Plate For Optimum Grip And Long Life 40-60 Percent Lighter Than Stock For Quicker Acceleration Lower MOI For Faster Throttle Response Replaceable Hardened 1050 Steel Ring Gear Billet 6061 T6 Or 2024 T4 Aluminum Body Stepped Dowels On Most Applications Bolt-on Replaceable Friction Plate Military Spec Fasteners For Reliability And Strength High Performance And Lighter Weight To Free Additional Horsepower Height: 2.50 Width: 14.00 Length: 14.00 Weight: 9.00 lbs