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I have run these bearing for about a year. They are supper smooth and just need some dry lube every few months and will roll forever. If you are running 7mm axles be sure to get the 8mm adapters (metal insert). At least that is all that was offered a year ago. I also run a metal spacer in between the bearings for more support. Vermicious Knid Ref Stateline Roller Derby Divas Beloit, WI