These bearing will last you years if looked after. They have no ABEC rating because they are specifically designed for skateboarding in order to withstand the pressures exerted upon them. These are the first choice of most professionals...
Single, removable, non-contact rubber shield allows easy cleaning and low friction.
High speed nylon ball retainer provides added strength and speed.
Pre-lubricated with Speed Cream™ racing lubricant.
Skate Rated™ clearances, tolerances, materials and lubricant provide the best performance and durability possible.