WOW is all I can say about these bearings. I went with the green seal bearings only due to where I race my RC's. The bearings see a lot of abuse in dusty/sandy conditions so reading the information on these bearings it seemed a no brainier! When I got them and took them out of the package and rolled them across my finger I was astound! They were ultra smooth and the inner race had no play like with what you find from other bearings.
I haven't been able to test these yet, but when I checked my stock bearing that were new and compared them to the Boca Green Seal bearings... I threw the rest of my stock bearings in the trash!
I highly recommend these bearings if your racer or basher for conditions!