They use real ball bearings in the wheels. Also roll well over large cracks or trailer ramps. I moved a full size Bridgeport mill slightly and winched it with 3 of them onto a dump trailer. Much better than skates that use ball bearings directly on the ground. I don't know why people complain about the wheels collecting dirt. from the floor. The nylon urethane wheel allowance makes it much easier to use for small imperfections compared to steel.
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