Friction plate set only. Specifically developed to handle the power and torque of High-Performance H-D M8 engines. This clutch set includes ''G3'' friction plates (which incl. 6 friction plates and 3 jutter plates). G3 is a newly developed friction material that offers as good or better performance than the Alto Carbonite clutch material. It is formulated with graphitic carbon-based particles which is the most durable; consistent with improved shifting and reduced burn-out product to date for high horsepower and torque applications. In short; this is an excellent clutch plate set for stock to very high performance engines and a direct replacement for the OEM clutch plate set. Incl. 6 x 581908 friction (1.50" /3.81mm thick) & 3 x 581909 friction jutter (0.151"/3.84mm thick) plates. Note: Compatible with OEM components and friction discs. A matching ''Performance Steel'' Alto steel drive plate set can be ordered separately as 581911.