The mould consists of two primary components, the injection mould (A plate) and the ejector mould (B plate). These components are also referred to as moulder and mouldmaker.

Injection molding is a process in which custom molded component manufacturers heat a polymer until it reaches a highly plastic state and forces it to flow under high pressure into a mold's cavity to solidify. Manufacturers then remove the molded part, or molding, from the cavity.