This is likely a small dish used for oil, and it had black stains all over. It's a half-cylinder that was soaked in bleach overnight for cleaning. I currently have a cold and a stuffy nose, so I can't smell anything. I believe most of the stains are gone, but I'm not sure if they're completely gone. Therefore, I haven't used the word "sake cup." Diameter: Approximately 5.4cm Height: Approximately 2.5cm Sizes are approximate. The actual item may differ slightly in color from the images. It is an old item, so there are age-related scratches, marks, and dirt. Please purchase with your understanding.