This is a pure copper product with high value. The subdued copper color expresses a sense of calm, and the plum blossom and bud patterns on the front and back, along with the openwork carvings, give a sense of nobility and luxury. I think it can be used regardless of the season. Diameter is about 12 cm, and the height of the rim is about 1.5 cm. The weight of one piece is about 75 grams. I obtained these several years ago. I have used one, but the others are new and unused. There is no verdigris or rust characteristic of copper, and there is no sign of aging. The shine is maintained by dry wiping. I have used one teacup coaster about twice, but there is no damage or dirt, and it is like new. There is no special box.