but they cannot be used on glass boards

The package contains:

To test the magnetic capability

but the surface is not like a whiteboard

TWISTER magnetkrog 2-pak, Ø25 mm. stål (roterende) julepynt but they cannot be usedA package of 2 rotating steel hook magnets from Trendform. Use hook magnets with a rotating hook when you need a full 360 degreees turning hook. These rotating hook magnets are great for hanging tea towels, kitchen utensils and keys. But also very handy in a workshop for hanging up wires, tools etc. Diameter: 25 mm. (about 0. 98 in.) Length: 42 mm. Strength: Approx. 3 kg. (6. 61 lbs.) These hook magnets have a 3 kg. carrying capability when used in a