ball bearing
Bearing
This Professional Full Ceramic Bearing is self-lubracated, don't need oil.
The Ceramic Bearing should avoid jumping / knocking / strike / collide, it can only be used for smooth speed skating.
The bearing is with ceramic inner ring / bead / support cage / outer ring.
The White Ceramic is made of ZrO2 material; the Black Ceramic is made of Si3N4 material.
Package Included:
16 pieces ceramic bearings with container.