I made a couple of penannular brooches this week. I had ordered one online but I was impatient for it to arrive, so I made my own using copper wire. I've never hammered anything other than a nail in my life, LOL. Here are my two copper ones along with the iron one that I had ordered. I like mine better because the pins are not so big and they don't put such a hole in the cloth. Because I hammered the copper it is tougher than the plain wire, but of course it is nowhere near as tough as the iron one. All of these are about two inches across.