Popular FULLY Ceramic (ZR02) bearings by Size

These are popular sizes bearings for fishing reels. Almost all of these are spool bearings for baitcasting reels, as that is the absolute best application for these bearings. Another popular application is the front and back of the oscillation worm of Shimano spinning reels.

Fully ceramic bearings have the lowest resistance of any bearing type, lower resistance even than the abec7 hybrid ceramic. Because of that, when installed on the spool of a baitcaster, the spool keeps spinning forever. These are also used for those forever-spinning fidgets that you've seen. You get the picture. They are also lighter, and because they have no metal, they have nothing to rust. DO NOT GREASE THESE!!!