For chawanmushi, soup, and more. This was a gift, so details such as the kiln are unknown. The dimensions of the vessel are as follows (please note these are amateur measurements): Main body: Approx. diameter 8-8.5 x 13 x height 6 cm Lid: Approx. diameter 9.5 x height 2.5 cm The last photo shows an example of use, fitting into a 21cm steamer. Will be shipped using recycled packaging.