The resin parts represent first stage engine and the upper stage of the launch vehicle, while the aluminum tube serves as the first stage airframe. The resin parts are molded around steel pins: the pin in the engine part serves to fix the model to the resin base (which should be attached to a more substantial wood base), while the second stage pin needs to be filed down to represent the needlepoint nose. The resin parts' pour plugs should fit into the aluminum tube with a bit of cleanup. There are no visible airholes in my parts, but the second stage part has a slight molding gunge that will need sanding out. The instruction sheet consists of a painting guide for the TV-3, TV-4 and TV-4BU launch vehicles.