Wildthings Ltd. Oxidized Sterling Silver 2mm Box Chain Made of Oxidized .925 Sterling Silver 2mm Box Chain in Lengths of 16", 18", 20", 22", 24" and 30" Lobster Claw Clasp Jump Rings are soldered for strength. These chains have an Oxidized Finish. Oxidation darkens silver and gives it a soft warm look as opposed to a high polished shiny look.