This was given to me by a friend, and it's the size of a coaster. The front is made of a metal material, and each one has a substantial weight, making them feel very solid. I don't know the details, and I couldn't find any information even after searching, so please understand. Unused item. Each side is approximately 9.5cm. It's a very lovely item. Shipping will be via either: * Nekopos * Yu-packet