The Halo ceramic series of bearings are a high quality steel/chrome bearing with metal shields and ceramic Si3N4 balls. They also contain our highly developed high speed/temp oil instead of grease for maximum performance. These bearings have been tested and proven by many racers.
1/2 x 3/4 x 5/32 Ceramic Metal bearing by Avid Racing Concepts is the standard bearing for Losi diff outdrives. Check your manual for the correct size for you vehicle if you are not certain.