This is a high-end Japanese tableware brand, "Shinkodo," from Niigata Prefecture's Shinkinzoku, renowned for its traditional Japanese craft of copperware. This is a hand-hammered rock cup with a pure copper and tin-plated finish. It has been taken out once for photography, but is essentially a new, unused item. From the web shop comments: These rock cups are handcrafted one by one with care by skilled artisans. The moment you touch it, you will feel the excellent thermal conductivity of copper. Once you experience the amazing coolness, the feeling of weight, and the dignity of a copper cup, you won't be able to use any other cup. Capacity: 340ml Size: Height approx. 80mm / Diameter (drinking mouth) approx. 80mm *Please forgive any slight errors due to amateur measurements. Retail price: 13,850 yen [Management number 265]