This top quality wheel & brake set is excellent for use on high-performance ultralights. Set includes: 2 aluminum wheels & brakes with 5/8" bearings, 2 axles, 2 spacers, 2 brake bleeder seats and valves, 4 brake line fittings, 12 ft. of 1/4" dia. x .035 wall brake line and 1 vertical master cylinder.