I have a couple light weight nylon one's I got from God only knows where. But for cat's I don't do a lot of walking so I made one from 1/4" cotton rope. About 8' bowline in one end and a nail with the head cut off on the other. Whipped on the nail then coated it with clear epoxy. I cut a slot under the jaw and push it up there also. I like that Idea of crimping on the nail with some break line! Gonna change mine to that!