Guro Cast Iron Spiral Teapot 1Liter (Red) High quality cast iron helps to keep your tea in the perfect serving temperature for longer periods of time. A stainless steel tea-brewing basket is provided in addition to your Guro kettle. Porcelain enamel interior coating preserves the pure taste of your tea and increases the tetsubin's rust resistivity . Each Guro tetsubin was dedicatedly crafted with the finest materials and thus it will last for many years. Fast & even distribution of heat throughout the cookware.