CeramicSpeed 6000 closed ball bearing.

CeramicSpeed makes some of the strongest, most accurate, and lightest rolling bearings on the market, which are all ceramic.

Ceramic bearings also provide better utilization of one's wattage.

Closed bearing, with "non-contact" seals.

The bearing is filled with CeramicSpeed Blue Grease.

The price is for 1 piece.