This is a gray-glazed hexagonal yunomi (teacup) by Daiki Tanaka. It's very light and extremely stylish. The entire piece is thinly glazed, with a beautiful, dripped glaze of a blue-green color applied on top. The inside of the cup also has a nice pooling of glaze, making it look beautiful. I've only used each one once, so I think you'll be able to use them comfortably. I purchased them for 3,520 yen each, or 7,040 yen for two. Long side φ7cm, height 8.2cm Shipped on weekdays via Yu-Yu Mercari.