The 3/16 x 3/8 x 1/8 Ceramic Halo series of bearings are a high quality steel/chrome race, Ceramic Si3N4 balls, and metal shields. These bearings have been tested and proven by many racers.
This is the common wheel and diff bearing used in all the 10th scale Associated and Losi cars.
We suggest that these are used in onroad conditions due to the performance benefits of a metal shield and the lack of dirt on the track.