Iwachu Tetsubin cast iron teapots are an art form that is centuries old. Still cast in the traditional way in Japan, it takes a week of skilled work to fashion a single tea pot. There are many traditional designs available; this one is known as the "Hobnail" design. Iwachu teapots keep tea hot for an hour. I particularily enjoy using this pot in the wintertime because I also have a cast iron tea warmer, which uses a single tealight, on which this pot perches. Nothing is more comforting on a cold winter's day, than a good book and a favourite pot of tea, quiety steaming atop the tea warmer.