This is a blue Katakuchi glass by Tokiko Kurokawa. The diameter of the base is approximately 8 cm, and the height is approximately 15 cm. It holds 490cc when full. As you can see in the image, there are air bubbles? inside. When touched from the inside, there is a depression, but the surface is smooth. The surface is smooth to the touch with no bumps or irregularities. It's an easy-to-hold size, and I used to use it for water.