Optional spur gear for 3-Pad Slipper Clutch. Precision-molded slipper clutch spur gear 87T 48P is manufactured out of XRAY's exclusive secret mixture of composite product, allowing kit to be robust enough to handle superior brushless machines. The spur gear was made to really have the cheapest possible fat while remaining strong and light. Each gear has a stamped enamel number for simple recognition.