SSR Metals Pvt. Ltd. Manufactures SSR Traction Scientific Equipment Enclosure. SSR Metals Pvt. Ltd. Is an ISO 9001: 2000 certified company. SSR Traction Scientific Equipment Enclosure is a modern electro mechanical system, molded aluminum gear box & metal gear gives long life and jerk free traction. It is based on solid state circuitry; it has silent, smooth and powerful motor to pull the appropriate weight.