Also known as Tetsubin, it is a traditional Japanese teapot known for its durability, insulation performance, and unique aesthetics. Usually made of high-quality cast iron, carefully cast and hand polished, the surface presents a smooth and slightly glossy texture. Not only is it a practical tea set, but it is also an artwork that showcases the owner's taste and cultural cultivation. In Japanese tea ceremony, the use of cast iron bottles is seen as a form of respect for tea art and for guests. Over time, cast iron bottles have become an indispensable part of tea culture and are deeply loved by tea enthusiasts and collectors.