SSR has always focused on manufacturing precise, lightweight, and strong wheels. In 1971 SSR released the first 3 piece wheel, the MK1. With aluminum wheels in high demand at the time, their release resulted in the creation of JWL (Japan Light Alloy Wheel) Certification in 1973. Because of this, the Japanese Government incorporated this new certification on aluminum wheels to improve quality and safety. SSR wheels are always put through JWL testing before they are used on the street or track. They are true JDM quality, precision, and design.