Must be used with ACT pressure plate and flywheel. Smooth engagement with reduced marcel for faster shift action and stock to low gear rattle; Premium organic friction materials for heat tolerance, faster recovery from overheating and prevents warping of mating surfaces; Spring retainers feature heat-treated wraparound spring windows that provide support and reduce stress concentrations that are common causes for failure; Recommended for street and race use; Modified with reduced marcel for faster shift action and has steel-backed linings for higher burst strength and quicker shifting and engagement 3001001 is a performance street disc and the most popular disc purchased. It features premium organic materials with high copper content for better heat transfer. Performance street discs allow for quicker shifting and smooth engagement. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. ACT spring-centered assemblies use bushings and cone springs similar to factory clutch discs. This creates frictional dampening, which improves clutch life and reduces noise. Quiet operation with increased strength and reliability.