These are tried and tested... if in doubt...
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 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.
Lubricated with Bones Speed Cream R.F.
A groove on the inside of each bearings inner race eliminates weight and allows insertion and removal of the bearing using the Bones Bearing Tool, even on hub wheels