Traxxas clutch bell is constructed of 20T hardened steelFits all Traxxas 1/10th scale nitro vehicles. Replaces worn or damaged clutch bells.Clutch attaches to the adapter unit on the crankshaft, makes contact with the clutch shoes and meshes with the main gear.INCLUDED: One Traxxas 20 Tooth Steel Replacement Clutch Bell, Two 5mm x 11mm 0.5mm fiber washers AND Two 5mm E-clips