F1 Racing Stage 1 Clutch Kit F1-81040R0-SS Premium organic friction material for high heat tolerance, quick recovery, good friction and long life Heavy-duty sprung center unit boasts heat treated springs and retainer rivets for the maximum power and durability Plate features special single diaphragm design to increase clamp load Horsepower Rating: 345 HP, Torque Capacity: 305 ft/lbs Disc OD: 11", Spline: 10