The Valair Heavy Duty Upgrade Clutch NMU70241-04 utilize ceramic buttons on both sides of the clutch disc to improve the performance of your 1999-2003 Ford 7.3L Powerstroke 6-Speed. Driving manners are very performance oriented with no clutch slip, basically the clutch is in, or it is out. Great holding capacity for modified trucks, the only way you will get more holding power is to go to a Dual Disc Clutch setup. Ceramic is a very hard material so typically flywheel wear is more noticeable using a ceramic clutch than with other materials. This clutch has a small window of usage, ideally suited to trucks with performance power modifications that do not intend to tow with there truck. (Not recommended for towing). If you plan on drag racing/ sled pulling or doing boosted launches you will need a Dual Disc Clutch Features: 13" x 1.375" Stock Organic Replacement Ceramic Buttons HD Spring Hub Rated @ 550HP / 1100 ft lbs Torque 3400# Pressure Plate Kit Includes: 3400# Pressure Plate, Heavy Duty Clutch Disc, Release Bearing, Pilot Bearing and Alignment Tool.