41 fl.oz. Black Cast Iron Teapot JANG with Filter. The Bredemeijer® Jang is the perfect Japanese model cast iron teapot. Its superior construction and durable enamel interior ensure that the temperature and flavour of the tea are retained for a longer period of time. Do you want to keep your tea hot for even longer? Then the corresponding tea light Tea Warmer provides the solution. The set can be completed with corresponding tea cups and a stand. The Jang is available in either a 3.4 or 5 cup version and is supplied with a stainless steel tea filter.