I found this while cleaning out my parents' house. It was kept in the cupboard, still in its box. From the instructions: Carefully selected, delicate bamboo strips are skillfully woven into a bamboo basket, which is then repeatedly coated with lacquer and meticulously finished. Therefore, it is resistant to deformation from heat or cold, and is a lightweight and elegant lacquerware. Furthermore, it is not affected by boiling water, alkalis, acids, or alcohol. Type of surface coating: Urushi lacquer Type of base material: Natural bamboo Ideal for guests. Although unused, I would like to trade with someone who understands that it has been stored at home for a long time. Japanese Lacquerware Guest Teacups Urushi Coasters