12x18x4 Rubber

The Halo series of bearings are a high quality steel/chrome bearing with rubber seals. These bearings have been tested and proven by many racers.

12x18x4 Halo bearing by Avid Racing Concepts is the standard outdrive bearing for nitro touring cars and 8th scale onroad cars such as the Kyosho RRR, Mugen MRX4, and Serpent 710. They are also used in the Revo, so check your manual for the correct size for you vehicle if you are not certain.