The 3/8 x 5/8 x 5/32 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.
3/8 x 5/8 x 5/32 Ceramic Halo bearing by Avid Racing Concepts is the standard bearing for Associated diff outdrives. Check your manual for the correct size for you vehicle if you are not certain.