E-Revo Ceramic Bearing Kit. Contains all the bearings, 33 in total, including steering and rocker arm ceramic bearings. This ceramic bearing kit will also fit the E Revo Brushless kit. If you are using RPM parts just make that selection from the drop down menu and we can substitute the RPM ball bearing sizes for our ceramic ball bearings. Traxxas did an excellent job with large diameter spec ball bearings such as 8x16 mm, 10x15 mm, and 6x12 mm in the rear diff and 12x18 mm and 6x13 mm bearings in the wheels. We provide you with all the bearings in our World Champion Ceramic Nitride Pro Series for unbeatable power, strength and performance.