I'm selling this because I no longer use it. I've used it for about 4 years. As it's an old item, there may be scratches, age-related deterioration, and stains that can't be removed. Please refrain from purchasing if you are sensitive to these issues. The size is 23.5 cm. There is a name written on the inside. I can add more pictures, so feel free to comment. To prevent any problems, please purchase only if you understand and agree to these conditions. I do not accept claims due to insufficient confirmation after purchase, or cancellations due to a difference in size or image, so please comment before purchasing if you have any concerns. It will be simply packaged.