The Exedy Heavy Duty clutch kit comprises a heavy-duty cover assembly, a premium quality bearing and an organic clutch disc. Perfectly suited for use in lightly tuned vehicles, the cover assemblies are tailored to improve clamp load, which allows the transmission of increased engine torque to the drivetrain creating a performance clutch kit with smooth take off drivability…The cushion button clutch disc are designed for moderately tuned and improved performance vehicles. This kit includes a heavy-duty cover assembly, a premium quality bearing and a cushion button discs incorporate a cushioning feature between the cerametallic linings to provide smoother engagement…The Heavy Duty Button (HDB suffix) clutch kits are manufactured to meet the demands of heavily modified vehicles. All HDB kits are supplied with high clamp load clutch cover assemblies and ceramic button clutch discs with sprung dampers