egg ring?

I've a couple of non stick rings and a couple of stainless ones and they work alright. I think the secret might be to shake them when you think they are done, no jiggle left. I've given up on the non stick, but it's easy tun a knife around them when the are done. finding the right size might take some searching, mine I think are a little large for a muffin.
I wouldn't pay any extra, they are just a ring of metal.