New Tsuiki Copperware, a sake cup, with a box. Diameter: Approximately 5.5cm Height: Approximately 6cm There is a small scratch on the inside. From the following website: 【What is Tsuiki Copperware?】 It is a method of raising copper by hammering it. Three-dimensional shapes are created by repeatedly hammering a single flat copper plate. The high skill of skilled craftsmen allows them to hammer out even the spout of a kettle. 【Sterilizing Effect】 Copper has a sterilizing effect and purifies water through ion effects. Copper vases are also famous for keeping flowers fresh longer. Using copper teapots and kettles enhances the flavor. Sake vessels made of tin make sake mellow and delicious due to the ion effect. 【Heat Conduction】 Copper has high thermal conductivity and excellent heat retention, so using a kettle will quickly boil water, saving electricity. Copper sake vessels quickly warm sake, and tumblers keep cold sake cold for a long time. You can also enjoy your drinks slowly. 【Durable and Long-lasting】 Copper vessels develop a deep luster the more they are used, and because they are not fragile, they do not break and can be used for a long time. It is also reassuring that maintenance is possible, as they can be restored even if damaged by dropping. They are masterpieces that can be used for generations. 【Made by Hammering】 This process tightens the metal and makes it durable. The beautiful texture of the hammer marks can be enjoyed as a landscape through the handwork of hammering and shaping. 【Points to Note】 After use, be sure to wipe it dry before storing. This is because if salty or acidic substances are left on the copperware, it can cause verdigris, a copper rust, to form. The more you use it, the more it will shine and become flavorful. That is also one of the pleasures.