They are made of a flexible magnetic foil on the back

yet it is impressive how strong it is

og denne magnet har skruehul til undersænket skruge M8 (8

you can also make the small iron pieces "dance" on the paper

Can be hung with screws

Undersænket powermagnet 40x40x4 mm. hyldeforkant They are made of aSquare neodymium magnet with 2 countersunk screw holes. Size: 4x4 cm. Height: 0,4 cm. Screw holes: 4. 5 mm. (x2) Length between screw holes: 20 mm. Strength: approx. 16 kg. You can fasten this magnet with 2 countersunk screws or bolts (not included) onto a piece of wood or surface that is not magnetic. Once secured, the countersunk square magnet plate will provide you with a strong magnetic surface. These magnets are fragile because they are not