Purchased at COLLECTORS in Kichijoji. The color is silver. According to amateur measurements: Small one... Inner diameter is about 1.3 cm Large one... Inner diameter is about 1.8 cm Thickness is about 2 mm. There are some minor scratches from use, but I think it's still in good condition. I am also selling a black one in the smaller size. Please understand that this is a used item. Thank you for looking.