This tetsubin is made of cast iron and its interior is untreated. Instead, after each work is cast it is baked in charcoal to prevent interior rust until a natural mineral layer is formed through use. The exterior is coated with an iron mordant base and urushi lacquer that gives it a reddish brown appearance.
Small Cast-Iron Water Kettle: Hailstones 玉型霰 江戸鉄瓶(Yokotsuka Yutaka)
Cast-iron kettle with hollow, forged handle with air holes (mushikui)
The inside is not coated
Holds about 33 floz.
Made in Tokyo Japan by Yokotsuka Yutaka