Before the advent of computer-generated imagery (CGI), visual effects of vehicles such as marine ships and spaceships were created by filming "miniature" models. These were considerably larger scale than hobby versions to allow inclusion of a high degree of surface detail, and electrical features such as interior lighting and animation. For Star Trek: The Original Series, a 33-inch (0.84 m) pre-production model of the Starship Enterprise was created in December 1964, mostly of pine, with Plexiglass and brass details, at a cost of $600. This was followed by a 135.5-inch (3.44 m) production model constructed from plaster, sheet metal, and wood, at ten times the cost of the first. As the Enterprise was originally reckoned to be 947 feet (289 m) long, this put the models at 1:344 and 1:83.9 scale respectively. The Polar Lights company sells a large plastic Enterprise model kit essentially the same size as the first TV model, in 1:350 scale (32 inches long). It can be purchased with an optional electronic lighting and animation (rotating engine domes) kit.