This item was used as an oil dish, so it cannot be used as a flat sake cup. However, I sometimes use it for things like dried sweets. I soaked it in bleach overnight, but the oil has not been completely removed. The black areas on the rim in the image are from the oil. Diameter: Approximately 11.3cm Height: Approximately 2.7cm The size is approximate. The actual item may differ slightly in color from the image. It is an old item, so it has age-related scratches, stains, and some small chips and scratches on the rim.