Bones Race Skateboard Bearings 8 packDETAILS SPECIFICATIONS Each Bones Race REDS Bearings 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 nuts Precision ground 0. 200 built in spacer to provide perfect 0. 400 spacing between bearings. Precision ground extended race eliminates the need for speed washers, and provides better alignment of the bearings when the axle nut is tightened.