Tamiya 54378 Slipper Clutch Set XV-01 FEATURES: Helps protect the drivetrain from damage from hard acceleration braking and jump landings Adjustable to provide high traction on low-grip surfaces;INCLUDES: Plastic Spur Gear Two Slipper Pads A & B Pressure Plates Slipper Shaft Slipper Spring Two Locknuts;REQUIRES: 48 pitch pinion gears #54218 #54382 (TAMC4382) or #54383