Arriving in 1955, the fiberglass Eames coded DSS stood for Dining (D) height, Side (S) chair, on Stacking (S) base. There were a few versions of this, including the introduction of a plastic shell. The side hook mechanism is for joining a line of chairs together. The DSS was extremely versatile and that super quality led the Eames DSS Stacking Chair to becoming the most popular institutional chair of choice! It is the DSS therefore that helped, perhaps more than any model, to put the Eames plastic shell chairs into modern folklore.