Turbo jet 2 in 1 building set r r 2 in 1 build a supersonic jet then build a heli plane with rotating propellers over 400 k39nex rods and connectors are included plus a battery powered motor build a jet with motorised rolling wheels and an open and close cockpit then take it apart and build a heli plane with working motorised propellers that you can adjust to spin vertically or horizontallyr r r 2 builds in 1 boxr r build a turbo jet then a heli plane with rotating prope