Halo - 5mm x 10mm x 4mm metal shielded bearings (4 pieces)
The Halo series of bearings are a high quality steel/chrome bearing with metal shields. These bearings have been tested and proven by many racers.
5x10x4 Halo bearing by Avid Racing Concepts is the standard bearing for 1/8th nitro clutches. Check your manual for the correct size for you vehicle if you are not certain.