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.
6x13x5 Halo bearing by Avid Racing Concepts is a popular bearing for vehicles/makes like the T-Maxx, E-Maxx, Tamiya''''s, and others. Check your manual for the correct size for your vehicle if you are not certain.