The exterior appears to be metal, and the interior seems to be ceramic, but I'm not certain. The inside has a night sky-like appearance. I believe it's an ashtray. It also has a shape similar to a golf club head. Size: Approximately 11.5 cm wide Approximately 8.5 cm deep Approximately 3 cm high Although it's unused, it has been stored for a long time. Please refrain from purchasing if you are concerned. The original box is very old and damaged, but I will ship it in this box. #Ashtray