For use with ACT solid flywheel only for proper clearance (Flywheel not included). Pull type clutch. Modified Rigid Street Disc Smooth engagement, quick shifts, increased gear rattle; Premium organic friction materials for heat tolerance, faster recovery from overheating and less wear of mating surfaces, rigid design may increase spline wear; Chromoly hub is heat-treated for strength and durability; Recommended for street and occasional race use; Steel-backed linings for higher burst strength, reduced marcel for quicker shifts 2000601 is a modified rigid-hub street disc featuring premium organic friction materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs are modified with reduced marcel for faster shift action to complement ACT pressure plates. The chrome-moly hub is heat-treated for strength and durability. Rivet design and materials are carefully selected for maximum strength. Lightweight, rigid-hub design allows for quicker shifting and engagement. ACT's street rigid-hub discs provide race-proven performance with street manageability.