Permanent jewelry chain sold by the foot. If buying multiple feet, the chain will come in one continuous roll. Material: Ion Plated 304 Stainless Steel Size: 4.5x11x1.2mm and 4.9x6x1.2mm Stainless steel is a non-reactive metal, which means it does not oxidize or tarnish like other metals such as silver or brass. Hypoallergenic. The ion plating process is done in a vacuum oven, resulting in longer color retention and a durable coating.