When NASA started building moving parts which were required to withstand the environment of space they were unable to use liquid lubricants or grease which freezes at low temperatures.

Full Ceramic refers to both the balls and the bearing races being made from a super hard Ceramic material (whereas most other Ceramic labeled bearings use a less effective hybrid of ceramic balls with steel races). Full Ceramic bearings spin with much less friction and for much longer than their lower priced counterparts (and naturally make a light buzzing sound as they spin!) The Full Ceramic design means that the bearings are completely water resistant and one third the weight of regular steel bearings. These bearings are designed for speed based skating disciplines, NOT impact based skating disciplines. Use for recreational skating, fitness skating, freestyle skating, slalom skating and speed skating.

Care instructions:
While ceramic-on-ceramic requires no bearing-lubricant out the box, bearing lube DOES help the bearing to keep spinning fast once its come into contact with dirt and dust. A light bearing oil is included with all packs of Go Project Full Ceramic bearings.

The best method of cleaning the bearings is with Aviation Oil. Where aviation oil is difficult to obtain wed recommend running the bearings under warm water, leaving them to thoroughly dry and adding a few drops of the included bearing oil before replacing into your wheels

Go Project precision bearing spacers included (x4).

Set of 8 (fits out 4x skate wheels). Use two packs for 8 wheels