The cube magnets can easily hold your pictures

kubeformede kobbermagneter i 5x5x5 mm

After that

so you can write with  chalk on the board and use it for magnets

Power magnet, Blok 40x40x20 mm. engros The cube magnets can easilyVery strong block magnet made of neodymium. You really have to know what you are doing before throwing yourself into handling a magnet of this size and strength, as careless use can be very dangerous! Length: 4 cm. Width: 4 cm. Height: 2 cm. Strength: approx. 60 kg. The magnet has a strength of approx. 60 kg. in a straight line. You get the most optimal pull when the pull occurs in the same direction as the magnet's field i. e. on the large surfaces