Moto Ceramic Pearls are the ultimate in ceramic skate bearings. The advantages of Moto Ceramic Pearls over other ceramic bearings are achieved by using the finest ceramic balls that are rounder, harder, smoother, lighter, and more durable. the ceramic also reduces friction, improved power transfer, and increases bearing longevity. As with all Moto bearings, our Ti-Nite races and shields are optimized for very low friction and maximum protection against dirt. Moto Ceramic Pearls... nothing even comes close! These Moto bearings come in set of 16 for roller skates