I get all of my bearings from avid. I used to get them 50 at a time when I was running nitro. Although they do have ceramics, I never tried them. I like to stick with conventional bearings in places where dirt might get in. That way, I'm only toasting a cheap $1 bearing. Their plain jane bearings are good though. I've had their wheel bearings in my buggy for over a year now and they still spin like they should. If you go to their website, be sure to check out the revolutions, or is it evolutions? They have a metal seal on one side and a rubber seal on the other. They supposedly have less friction or spin more freely and the metal seal makes maintenance a bit easier. They also come packed with grease.