looked for the post where a guy had discovered the rpmouthouse pulleys come with some cheapsheit bearings to give him a thanks, but couldn't find it. Well I have a set of four I bought before I wised up, here is the bearing from japan that came in them (not sealed, completely the wrong application) and the best quality NTN's I could find to replace them. The sealed bearings, the same type you would have in an alternator pulley, were heavier and you could feel the diff when you spun them by hand. I didn't wait for the rpmouthouses to fail but if you search there are a lot of guys that do have them fail, mine only had about 3K, but 2K of that was after I found out they were croppola and that was enough worrying. Boy does it pay in the long run to just buy the quality part and not worry about saving 5 bucks. nuff said.