The 1/8 x 5/16 x 9/64 Halo series of bearings are a high quality steel/chrome bearing with metal shields. 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 flanged).