Cast-iron teapot (tetsukyūsu 鉄急須) featuring a bamboo and plum flower design. Outwardly, it resembles a traditional tea kettle (tetsubin), but it is specifically designed for practical tea brewing. The interior is coated with enamel, protecting it during use and enhancing its suitability for steeping tea; however, it is not intended for heating water directly, as high heat can damage the enamel. Typically, a removable tea strainer accompanies this kind of teapot, allowing for loose-leaf brewing with ease and elegance.