After designing the desired part with exact specifications, the investment casting process begins. Often, a prototype is created to ensure that the part specifications meet the application’s needs. Next, a tool is build that matches those exact specifications. The tool contains a cavity that is then filled with wax to create a pattern that holds the precise dimensions of the finished parts to be cast. While the tooling is one of the most costly aspects of investment casting, it is actually an excellent investment for longer runs. It can be used to make many finished castings.