Premium tumbler, a pair set. These are insulated tumblers with a double-wall construction. According to the description, the polished interior creates fine, long-lasting foam. They are made in Tsubame, Niigata Prefecture, using metalworking techniques by the "Migakiya Syndicate." Made of stainless steel. At first glance, they seem like ordinary tumblers, but they are excellent products incorporating various technologies. Thank you for your consideration. Size: Diameter: Top: approx. 7cm, Bottom: approx. 5cm Height: approx. 12.5cm Weight: 174g