I thought it would be nice to have a retro feel, so I inherited it from my grandmother, but I decided to sell it because I ended up not using it. As you can see from the photos, each piece has a different design, and it says "10mm pure copper." It's unused, but it has been stored for a while, so please understand this before purchasing. Please note that I will ship it after taking it out of the wooden box. Diameter: 11.5cm