TRA Stampede VXL 2WD Sealed Bearing Set (15) 5x11x4 You are purchasing the bearings listed above. In many cases the bearing sizes may change depending on your particular model and the date that it was manufactured as well as different hop ups you may have installed. PLEASE DOUBLE CHECK you R/C before ordering to make sure you get all the proper bearings. We try to keep the kits updated as best as we can.