The Halo ceramic series of bearings are a high quality steel/chrome bearing with metal shields and ceramic Si3N4 balls. They also contain our highly developed high speed/temp oil instead of grease for maximum performance. These bearings have been tested and proven by many racers.
This is the common bearing used in the Team Associated 12th scale in the front wheels that do not have a stopper in the middle such as Jaco and Parma (these are non-flanged).