A traditional Japanese cast iron kettle (tetsubin), specifically a heavy-textured Nanbu ironware piece featuring a low-relief cast design of reeds or bamboo along the lower body and a graceful bird in flight.
True tetsubin kettles are unlined on the inside and meant to be heated directly on a heat source to enrich water with ferrous iron, unlike enamel-lined iron teapots (tetsu kyusu).
