A fidanza flywheel can mate with any type of clutch material, including organic, kevlar, ceramic, metallic and sintered iron. we attach the friction surface with military grade aerospace fasteners. the ring gears are made from 1050 steel and are heat treated for durability. the gears are heated then pressed on and secured with grade 8 button screws. we were the first to use a stepped dowel system in most of our flywheel applications. this doweling method ensures that once the pressure plate is installed the dowels cannot be removed because they become locked into place. no chromemoly can compete with the awesome serviceability, strength and superior design of fidanza 's aluminum flywheels. if there was a better material out there, we would be using it. Flywheel weighs 14lbs.