It's called Tsutsu-gata in Japanese, a cylindrical tea cup or if you like a simple glass.
Enjoy the Japan style in your house!
Black stoneware tea mug with white glaze inside and just a brush outside .
8cm ⌀ x 9cm h
Every ceramic piece is handmade and dimensions may vary slightly. The glazing effect on each piece is unique and the images are for reference only.