While I use many of these stampings in my other Etsy store. www.etsy.com/shop/twistedsisterarts many of my fans wish to have access to them. To that end, here's a store that you can browse, buy and create to your hearts content. You'll find the stampings and eyes here. One of these days I'll complete the series and provide wire that I use too.
The inside measurement from side to side is 18mm, I'm thinking of adding a 20mm eye to it, but haven't gotten there yet. A heat patina gives it a great color.
The size of the single piece is 42x42mm.
The finish is raw brass. I could change the patina or finish of the piece by torching it with a heat source like this video
https://www.youtube.com/watch?v=L-4IONuVA2k
I could also change the patina or the finish of the piece by using this technique as seen in this video.
https://www.youtube.com/watch?v=b160j_DXgRw