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.
1/4 x 3/8 x 1/8 Flanged Halo bearing by Avid Racing Concepts is the standard bearing for Losi XXXNT clutch and axles for 1/12th scale cars. Check your manual for the correct size for your vehicle if you are not certain.