ACT 4236208 4-Pad Sprung Race Clutch Disc Aggressive engagement with fast shift action; spring-center construction for low to moderate gear rattle Premium ceramic friction materials provide low wear rates and high heat tolerance Utilizes wraparound spring windows, thicker retainer stampings and a heat-treated spring steel drive plate to provide support, reduce stress concentrations and increase strength and reliability Recommended for race use only Spring-centered construction dampens torsional vibrations for quieter operation and resists failure under harsh conditions