A .J. Oster Company is a family of metal service plants that maintain an extensive inventory of copper, brass, phosphor, bronze, nickel silver, beryllium copper and aluminum for many end uses. Each center is equipped with a range of production capabilities that include precision slitting, sheeting, traverse winding and hot air leveled tinning. From heavy strip to foils, Oster has a variety of gauges and tempers available for immediate processing and delivery. The company is known for its copper and brass, but it also has an extensive inventory of cold-rolled and stainless steel, aluminum and an enormous variety of alloys. It offers customers just in time delivery service with its products packaged to customer specifications. Oster s processing capabilities include tin coating, traverse winding, slitting, edging, rolling, annealing, straightening and die cutting. Olin Brass acquired the company in 1991. A. J. Oster Company operates a facility in Carol Stream, Ill.