Pure copper tumbler 2pcs

Made in Tsubame City, Niigata Prefecture, a world-class metalworking production area. Copper is said to be the first metal used by humankind. It is a very excellent material because it has high corrosion resistance, has antibacterial properties, and conducts heat and electricity more easily than other metals. Despite its high price due to these characteristics, it is widely used in construction, automobile parts, marine paints, and electrical appliances. The base material is “pure copper,” which boasts a purity of 99.95% or higher. It is also a fascinating material that you will feel attached to, as it changes its color through oxidation and aging and transforms into a unique color and luster. A circular copper plate is slowly stretched over time to its present shape, scraped repeatedly in every detail, and then carefully polished. The inside is specially polished to create a fine and smooth foam especially when used with beer. The engraved five stars represent a tribute to the quality of the materials and the craftsmanship of the artisans, making this a delightful tumbler to enjoy cold drinks even more deliciously. 【Production】 Japan　Tsubame City, Niigata 【Size】 Tumbler：φ80×H150mm×2　capacity：380ml×2 Coaster：W80×D80mm×2 Paulownia box：W188×D173×H93mm weight：600ｇ 【Material】 Tumbler：Pure copper Coaster：Linen Paulownia box：Paulownia・Sanadahimo 【Spec】 Tumbler inside：Plating processing　outside：Clear painting