Magnetic Pots are usually made with iron housing structure and Alnico Magnets, suitable for high operating temperature, up to 450 °C. Usually these pots have inside threaded holes and are nickel coated.
Magnets are inserted by pressure inside an insulating brass sleeve. They can be made also with Neodymium Magnets with maximum working temperature of 230°C. In this particular case, the outside shelling is brass, with bipolar system.