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 sufficient to address high-performance brushless engines. The spur gear was created to have the lowest possible weight while remaining strong and light. Each gear has a stamped enamel number for easy recognition.