ACT Performance Race Disc Features: -Quicker shifting due to reduced weight -Higher torque and heat capacity than organic discs with fade free characteristics -Longer clutch life through ACT's careful selection of materials and features -SFI to insure safety Sprung Centered Benefits: -Choose Four Pad for the Quickest Shifting -Choose Six Pad for Better Heat Capacity and Better Engagement -Reduced Driveline Shock and Spline Life Through the use of Torsional Dampeners -Quiet Operation by Reducing Torsional Vibrations