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Warren, Michigan


For more than 40 years, we have developed a reputation as a “World Class” manufacture of production molds for the plastics industry. Today, Proper delivers a wide range of services including product development, prototype and production molds, secondary equipment, as well as production injection molding. To further support our customer base, Proper has established a global footprint with facilities in Warren, MI, Anderson, SC and Shenzhen, China. As a world class supplier of industrial plastics we are committed to providing industry leading technology, sophisticated program management, and traditional craftsmanship; specializing in transportation industries. Covering all facets of manufacturing, we provide a turnkey approach from design to production. Visit our website for more details at


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