you must catch onto a part of the frame where the magnet can get a good grip

The hook magnet is only magnetic at one end (opposite the hook)

Can be combine with all types of magnets

That being said

magnetic cars in one package and they come in a nice box

Affaldssortering “plast" - magnetskilt 30x30 cm. Tier1 you must catch onto aBuy all pictograms from the waste sorting series here at Magnetpartner. com. This is a plastic pictogram, printed on strong magnetic foil with UV ink. That is you get a strong magnetic sign that holds up to wind and weather and that resists the sun's rays for a long time without fading. We will translate the signs into you local language just write us an e mail with specifications. So don't mind the Danish translation on the picture. Can be used