As with all RAM specialty drag racing clutches, RAM truck pulling clutch systems are custom-built and assembled for your specific application. Based on the eleven inch Long Style cover design, these units feature a heavy gauge stamped steel cover with welded spring cups and a steel pressure ring. A billet aluminum pressure ring with segmented steel inserts is an available option that we highly recommend. Static pressure, often referred to as base pressure, is adjustable and as engine RPM increases, the centrifugally assisted levers apply additional pressure to lock the clutch up tighter as the truck travels down course.