Rigid magnets are quite a young, very interesting product on the market. They are about 3mm thick and, as the name suggests, they are rigid due to the use of an internal metal element. Thanks to a very thick magnetic foil (about 1mm), the rigid magnet sticks very well to magnetic surfaces, e.g.refrigerators. This product does not come in any shape. There are several ready-made square and rectangular dies, the most popular of which is 78x53mm.