The 1/8 x 5/16 x 9/64 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.
1/8 x 5/16 x 9/64 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).