This is a pair of Kagami Crystal Edo Kiriko "Seibo" sake cups. They are made using traditional Edo Kiriko techniques. They have the transparency and brilliance characteristic of crystal glass. This is a high-end Japanese glassware brand known as a purveyor to the Imperial Household. Diameter: Approximately 6.8cm Height: Approximately 6.7cm These were received as a commemorative gift, and the company name is printed on the back of the wooden box lid. Due to the nature of the camera, there may be differences in color and fine details.