ZM5-XTG4 2006+ Mazda MX-5 ACT XT 4-Puck Sprung Hub Clutch Kit includes a pressure plate, clutch disc, release bearing, alignment tool, and pilot bearing. XT Xtreme Pressure Plate:Clamping loads increase 50% - 120%. Pedal effort feels moderate to stiff. SFI certified to ensure safety.G4 Spring Centered 4-Pad Disc:Recommended for road racing. Track geared disc that will hold up to track abuse and be tame enough for the street, perfect for non-daily driver lightweight autocross and time trial cars that are driven to the track. Benefits are: increased torque capacity and spline life over a solid disc, lower inertia, faster shifts, quiet operation, reduced driveline shock, and sharper engagement than stock type or 6-pad disc.