MBCI is the largest manufacturer of metal building components in the industry, servicing primarily three market segments. The Commercial-Industrial segment includes small and large manufacturers of primary frames. MBCI products, such as metal roofs and walls, are combined with manufacturers' frames, thereby allowing them to offer a proprietary building system. Architectural products are utilized on conventional construction framing, metal building and retrofit projects. Users include architects who specify MBCI products, general contractors and subcontractors. MBCI also produces components such as secondary structural and panels for the self-storage industry.