Cell Selects have built in spacers AND built in speed rings or speed washers- never crush a bearing when tightening the axle nuts- Aligns the wheel to the axle for max performance. Abec 3 rating- but Abec rating has nothing to do with how the bearings function in skate performance. They are made of high quality steel with excellent shields to keep out grunge and grime. An affordable bearing, that looks great too, with a ton of upgrade features. No inner shields for easy access cleaning.