Given the nature of military models, hobby practitioners for the most part lean toward realism in their creations. The way in which these creations are produced are nearly as wide as the hobby itself, ranging from building a model kit "from the box" to kitbashing to complete scratch building of a model. A wide range of kits are available on the market, with built results ranging from hyper-detailed representations of a subject to crude playthings. Aircraft kits tend to contain a cockpit interior, with some kits opting to include a full engine as well. Armor kit often feature workable hatches for crew figures, and a few contain fully detailed interiors. Prices also range greatly, from below $20 to over $100. Most modern kits, of all scales, are made mainly from a hard plastic (typically styrene) through injection molding. However, high end kits typically contain photoetch. Despite the general trend towards plastic, some kits are still made entirely from resin or white metal. There are even kits made entirely of photoetched metal on the market. Construction is typically carried out using plastic cement or cyanoacrylate ("super glue") to attach parts. Plastic parts normally require removal from a sprue use side cutters or a hobby knife. Parts are typically cleaned of seam lines and other imperfections from the molding process before attachment. Upon completion of a model, it is common practice to paint it (see "finishing").