Azmaya's new Tetsubin was added. It is quite similar to the old model, but it contains "traditional oil grilling" with camellia oil and tea stains. https://www.shokunin.com/en/azmaya/tetsubin.html
You can use it for a water pot, a coaster and a confectionery dish. Because it does not break, it is also useful as a dish in the outdoor. https://www.shokunin.com/en/syouryu/