The "seals" do not contact the inner race and the tolerances felt noticeable looser than the worn bearings I was replacing. These bearings appear to be of the same quality as all the other Chinese bearings that are half the price. They might work in a clean environment but just save your money and buy the dirt cheap bearings or cough up the cash for an actual 2RS bearing. I don't think maple ace is a bad company, they appear to sell higher end bearings, this listing was just misleading.