ACT (SB10-HDG6) HD-M/Race Sprung 6-Pad Pressure Plate Kit Premium ceramic friction materials provide low wear rates and high heat tolerance; The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance Recommended for high horsepower street or 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