These are the wooden cup series made in Yamanaka shikki. 2 different colors are available. One is the beautiful grain of Mizume(Japanese cherry birch), and the other one is coated with Urushi lacquer of the jet black. The rim of Urushi lacquered cups is colored with silver. The material is Sakura(Wild cherry). It is very light. The nature of wood helps keep the temperature inside the cup. A drop of water does not adhere outside even if putting a cold drink.