If you need a replacement cord, or a few extras, this is the place. The leather is a greek leather, dyed black. I find they last at least few years, and don't bleed dye as do some of the less expensive leather cords. The ends/findings of the cords are sterling silver, finished with a sterling silver 13mm lobster claw clasp. The ends are both glued on and crimped on; they're very solid.
I keep standard measurements on hand - 16", 18", and 20", but can make them any length for you. The measurement is from end to end, including the findings.
It's available in 2mm and 3mm thicknesses, if you have questions about sizing for your particular application, just ask.
Price includes shipping.