Size: Inner diameter approximately 17mm (see photo 6). Weight: Approximately 6g. Art Clay Silver (silver clay) is a clay-like material made of fine silver powder, water, and a binder. It is said that when fired, it becomes almost pure silver. This item has been stored at home for a long time after being made. I have polished it with a silver cloth, but due to the nature of silver, it will oxidize and turn black over time. Please understand that this is a handmade item by an amateur before purchasing. I plan to ship via Yu-Packet Post Mini. I am also listing other items in the same category. #Silver #SilverClay #Handmade