Used 40mm kart racing axle. "A" label for stiffness which is a little softer than the standard medium one. Comes with brake hub and rotor, gear hub and gear protector, 40mm axle bearings with casette holders and American pattern hubs. You will need to get a keyway for each wheel hub and rotor as the gear hub is the only one with a keyway. This same package is $520.00 on a leading Kart Shops website. Save a few hundred with this Axle set up. Can be used for drift trike or barstool or other projects requiring this axle as well