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ABEC 5 CARBON Nils Extreme bearings are made of high quality carbon steel that provides excellent hardness and strength. They have low rolling resistance what results in high speed capabilities according to American Annular Bearing Engineering Committee standard (ABEC). Another important parameter of those ball bearings is their eccentricity – roundness on the track in the inner race, that is only 0,0035mm. ABEC 5 CARBON Nils Extreme bearings are intended for inline skates, skateboards and scooters.