Valair put a lot of time and effort in designing their ZF6 clutch kits in order to determine what will truly cure these clutches from failure, and actually be able to hold some power and heavy duty towing. We offer their HD clutch replacement kits that include a heavy duty 4000 lb. pressure plate and solid flywheel. Their HD Ceramic / Kevlar clutch kit, as shown here, is designed for those looking for substantial holding power over stock (up to 500 RWHP), yet doesn't want the aggressiveness of a FULL ceramic. This is due to one side of the clutch featuring Kevlar buttons, which have the ability of withstanding slippage better than ceramic. So, this is the perfect clutch for those that have up to 400-500 RWHP yet still daily drive the truck and tow, but hot rod now and again, as well.