Another Spragwerks original! the leash itself is made from 5/16" round leather cord(black or natural) (traditionally used for drive belts on sewing machines) each end is capped with a original Spragwerks cap, and D- ring. These are cast in bronze the epoxied and riveted to the leather cord. comes with a heavy weight split copper jump ring on either end (so you can attach it to you wallet /keys easily). email me if you need a special size-