In 
Out5x10x4 Flanged Rubber
Product Overview
The Halo series of bearings are a high quality steel/chrome bearing with rubber shields. These bearings have been tested and proven by many racers.
5x10x4 Flanged Halo bearing by Avid Racing Concepts is the standard bearing for the Mugen MST-1 Truck. Check your manual for the correct size for your vehicle if you are not certain.
