Some of the smallest microcellular parts and pieces needed for automobiles, construction, and other items are created through the process of injection molding. Additionally, insert molding magnets can help to complete the injection process. There are also prototypes created from this process and polyurethane Reaction Injection Molding (RIM) processed materials. Different materials are used in the different versions of this process, making any of the cells as small as one-thousandth of an inch.