The level of magnetism is not strong enough to work through the glass

Design: Magnordic

there is also a dome in the center of the lifting magnet

It has a stronger magnetism and therefore can be used for more applications (plus it doesn't slide off boards and metal edges as easily as thin magnetic foil)

which is why it can rust over time if it is not sealed

Kraftig magnet mini-max, Rainbow 4-pak Auto-translated (SE) The level of magnetism isSet with 4 pcs. of strong mini max magnets i rainbow colored metal. If you enjoy a minimalistic look that, at the same time, is practical, you will really like these strong magnets. Great for both the fridge and the magnetic office board (whiteboard or metal). But we don't recommend using them on magnetic glass boards as the metal on the magnets is very "slippery". So the magnets will only just hold their own weight if you have a really magnetic glass