Tamiya TT-02 Chassis Rubber Sealed Ball Ball Bearing for RC Cars Kit for RC Car (8) 5x10x4 (4) 5x11x4 (4) 8x12x3.5 Kit contains all upgraded bearings to replace your stock factory bearings and bushings. ABEC rated with Chrome Steel balls, Hi-temperature, low drag lubrication. Maintenance free rubber seals to keep the contamination out and the grease in. Complete Ball Bearing Kits are custom packaged for your vehicle.