Unplated, unfinished copper. May darken with age. Made with round wire, 0.6 mm wire. Med links. This was obviously intended to be plated with silver or gold, and instead, wound up in the warehouse until we got it - you will note from the additional photos that the clasps, already installed, are brass, while the chain is copper. The pattern of the chain is triple links, a link in a link in a link. You get a single chain with a clasp attached.

3mm x 4mm By the each.