5x16x5mm Ceramic Bearing. This bearing comes with our Premium Contactless Metal Shields that not only act as a lubricant seal, but being contactless allows for higher RPM, less friction and less heat. Ceramic balls are lighter for less centrifugal force, allowing motors to spin at a higher RPM and also to accelerate faster. Plaig Bearings are a stronger, more reliable bearing with greater heat resistance and superior life to the standard factory bearings. We stock all other sizes of bearings for RC Cars and also sell Complete Bearing Kits for many popular brands of vehicles.