This type of magnet can be used on glass boards

If you need a full translation of the package

It can be used on whiteboards

and much more

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Power magnet, Blok 20x10x3 mm. Tier1 This type of magnet canNeodymium magnets Strong NdFeB magnets Length: 2 cm. Width: 1 cm. Height: 0. 3 cm. Strength: approx. 2. 8 kg. Flat and square super magnet with incredible strength. Do not underestimate what 3 kg. in direct pull can do, and 2 magnets against each other in collision can do quite a lot of damage. So watch your fingers and keep magnets at a good distance from each other (min. 10 cm.), if they are not secured in place. SPECIFICATIONS: Strength: approx.