This leather necklace is made from Nooga Leatherworks' shop scrap when possible, saving it from the landfill.  It's mostly cut from a fresh hide because of its length.  It's high quality, top shelf leather.
The width is 1/8 to 3/16 inches and when fully open it is approximately 8-1/2 inches in diameter making it plenty large inough to fit over your head.  Closes down to 4 inches in diameter.  It can also be wrapped a few times around the writst for use as a bracelet.