Set of 16 Wicked Koyo WCD Skate Bearings which will cover a set of 8 wheels. Koyo bearings are proudly made in Japan using the best quality steel available. The inner and the outer rings made out of chrome steel, the cage out of glass fiber reinforced poly amid and the lubrication is the lowest viscosity Japanese made oil. They are ultra fast spinning an extremely durable, nothing compares to these samurai approved weapons.