to the 'out of the box' build. Today, a stock kit can be very highly detailed. Customized models Customized kits are typically built by more experienced modelers who take a kit and add components, either scratchbuilt or commercial conversion or aftermarket accessories. Such models may be more highly detailed than a straight build 'out of the box' though the trend to more detailed kits is decreasing the difference. The term 'kitbashing' denotes models built using parts from more than one kit to make a single, more accurate or different model. Many armor modelers engage in the use of aftermarket sets and built from scratch (scratchbuilt) parts to make their models more accurate or simply unique. In extreme, master-level cases, a model with hundreds of kit components may be detailed with several hundred additional commercial and home-fabricated parts to reach a very high level of realism. Scratchbuilt models Scratchbuilt models are those for which no kit exists; highly skilled modelers create their vehicle from sheet plastic and components they fabricate themselves. Some scratchbuilt models may contain a few commercial components, but typically it is a small proportion of all the model's parts. Scratchbuilt models may also be made from brass and aluminum, cast in pewter (a low temp metal) and cast with 2-part resins in molds made of RTV rubber material. A scratchbuilding modeler should possess talents in the following areas: soldering, gluing, drilling, taping, grinding, sanding, cutting & shaping in metals and plastics, creating RTV molds (1,2 & 3 part types), painting & weathering, research of prototype material, casting in low temp metals, creating sketches and diagrams of what is being made, measuring in inches or millimeters, use of calipers and other specialized tools. Aftermarket "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. Aftermarket markings are also available. Firms such as Archer Dry Transfers or Decalomaniacs produce stand-alone sheets of wet or dry transfer markings to allow the modeler to complete a different or more accurate variant. Enthusiasts may pursue military vehicle modeling in its own right