Traxxas X-Maxx Sealed Ball Bearing Kit for RC Cars for RC Car Kit Includes: (7)5x11x4 ..... (2)6x13x5 ...... (3)10x15x4 ..... (1)12x18x4 ..... (8)15x24x5 ..... (4)17x26x5 ..... (4)20x27x4 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. Packaged in a quality reusable FastEddy resalable Bag.