Traxxas Nitro Stampede Ceramic RubberSealed Bearing Kit Steel Races and Cages combined with Ceramic Balls, Non Contact Rubber Seals , and Grease, will give you the absolute strongest and best off road performance available.We have included no contact rubber seals to keep the contamination out and the super slick grease in. This offers the outstanding durability that off road demands.This is truly a WINNING combination. The high-performance and durability of ceramic balls, and the No maintenance durability of rubber seals and grease will keep you going smoother and faster then any other bearing on the market. (14) 5x11x4Ceramic (2) 5x10x4Ceramic You are purchasing the bearing 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. If you find a variation or mistake in our kits, please contact us so we can look into it.FastEddy Bearings