8mm - Everybody knows Rollerbones. This is a good bearing for a great price.
One of the most popular bearings for Roller Derby, these bearings have withstood the test of time.
Removable synthetic high speed ball retainer, shielded one side allows for complete cleaning and relubrication, hardened steel balls, deep grooved speed races, high temperature, low viscosity lubricant.
Super REDS™ are a superior quality bearing, using higher quality steel races, better quality and grade of balls, and a superior surface finish. The result is a bearing that is as fast as REDS™ but quieter, smoother, and longer lasting. Super REDS™ use a black shield and laser engraving to differentiate themselves from original REDS™.