Ram Clutch Powergrip Performance 11" x 1 3/16-18" Clutch Sets feature an increased clamp load pressure plate and a blend of 300 and 900 series friction material disc on an 8 spring hub carrier. Springs are encapsulated in a urethane material for additional center hub strength. It provides up to an 80 percent increase in holding power without chatter that is prevalent in paddle disc design clutch sets. All RAM clutch sets utilize a balance of increased clamp pressure and friction material to achieve holding capacity throughout the entire RPM range, not just at high RPM. They include the pressure plate, clutch disc, release bearing (non-hydraulic apps), and alignment tool. Use these for bolt on cars to 550 hp with mild modifications that are primarily street driven but may see some track time. If the vehicle sees much race track action, select the next higher level set.