Pyrex heat-resistant dish. It's a heavy and durable dish. [Photo 5] It seems like there's a single air bubble inside. The numbers are all different: A-01, 04, 12, 19, 23 Diameter: Approximately 18.5cm No pets, no smokers. Please purchase only if you understand that this is a long-term storage item from a private residence. It will be wrapped in cushioning material, placed in an empty box, and shipped anonymously.