ACT (ME2-HDSS) HD-M/Perf Street Sprung Pressure Plate Kit Premium organic friction materials for heat tolerance, faster recovery from overheating and prevents warping of mating surfaces; The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance Recommended for street and race use All ACT pressure plates are dynamically computer balanced for smooth operation at high RPM; Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches