"Aftermarket" denotes any kit or detail set that is sold to replace existing kit parts in order to reproduce a more accurate model or simply a different version not otherwise available. The media used by aftermarket companies range from turned aluminum and brass, photo-etched steel or brass sheets, pre-bent brass wire, cast metals, and resin. Notable aftermarket companies include Formations, The Tank Workshop, Tank, Azimut, Eduard, Verlinden, Friulmodel, Legend, and Modelkasten.