Friction plates are lined with a Kevlar fiber impregnated lining that grips and last longer than standard cork based plates. Friction plates and pin planished steel plates are precision measured as an assembly to re-set your bike to the exact stock stack height. Kit comes with heavy duty, shot peened, heat treated and tempered carbon steel clutch springs are 15 percent tougher than stock for better clutch engagement and reduced slippage. Forged aluminum drive plates are made with Wide Ear construction to spread the load in the clutch basket and prevent the ears from cut into the clutch basket. A perfect low cost performance upgrade alternative to OEM.