Resin casting is a method of plastic casting where a mold is filled with a liquid synthetic resin, which then hardens, and is used to produce collectible and customized toys and figures like designer toys, garage kits and ball-jointed dolls, as well as scale models, either individual parts or entire models of objects like trains, aircraft or ships. They are generally produced in small quantities, from the tens to a few hundred copies, compared to injection-molded plastic figures which are produced in many thousands. The upside is that creating the initial mold is much less costly than in the injection-molding process. But Resin casting is more labor intensive than injection molding, and the soft molds used are worn down by each cast. The low initial investment cost of resin casting means that individual hobbyists can produce small runs for their own use such as limited sales, Expo or home display, etc.