Our Diaphragm Spring Clutch Kits Feature our Kevlar Friction Plates And Hardened Steel Drive Plates. Which Stand Up To Extreme Amounts Of Torque. This Translates To Exceptional Durability Over Original Equipment. Billet Steel Drive Hubs Ensure They Will Not Crack Or Break Under Extreme Conditions. Diaphragm Spring Clutch Kits have a better clutch lever feel than a Stage-1 clutch. As a result, this clutch is perfect for a daily rider. Diaphragm Kits Include a Heavy Spring to accommodate Most Horsepower Applications. You can purchase a Lighter Spring separately, or you can state you would like a Lighter Spring in the “Note Section” of your order.