Unity® Cast Iron Kobe Teapot “ Matte Black Finish. An elegant, distinctly shaped Cast Iron Tetsubin teapot named after the beautiful and ancient city of Kobe, Japan. Inspired by highly prized antique Japanese Cast Iron teapots still in use today. Features a Black Porcelain Enamel Interior Coating that helps prevent rust. For brewing and serving tea; Not intended for stovetop use. 29 Oz. capacity.