Set of 2 brown cylindrical yunomi tea cups - Color: Brown - Size: Set of 2, large and small - Bottom marking: Kokuzo mark - Shape: Cylindrical A type of pottery unique to Sado, Mumyoi-yaki, made from iron oxide excavated from the Sado gold mine. After firing, it becomes very hard and produces a clear sound when tapped. These are said to be "vessels to be nurtured," developing a luster the more they are used. Thank you for looking.