Each bones race reds bearing is made with upgraded top quality bearing steel ground to perfection and polished best for racers who use precision trucks and properly tighten their axle nutsprecision ground 0200 built in spacer to provide perfect 0400 spacing between bearingsprecision ground extended race eliminates the need for speed washers and provides better alignment of the bearings when the axle nut is tightenedlubricated with bones speed cream rfa groove on the inside of each bear