Diameter of the vessel is approximately 15 cm. Regarding the blue masking tape, There are spots of blue paint from the manufacturing process. Please understand and accept this for long-term storage. It's also good for a small item holder or interior decoration. Thank you. Please understand that the color may differ slightly from the photos. I don't know what kind of pottery it is. However, There is a signature, like a name, on the back of the vessel.