They are quite strong. The place it was stuck in the picture was a corner wall and it was held in place by a metal corner. My intention is to keep the headset behind the bed and it stuck to another wall magnet. (Not illustrated) Vertical pull is stronger. I had an Ikea nightstand and was able to move the nightstand without moving it. While the side table wasn't heavy, it gives me confidence that my headset will fit on it. I bought it because I don't really like drilling holes and I want my walls to stay intact. I haven't tried it to the max, but if I have time to play around with it I can install and update it. I would say it's pretty strong. On a straight metal surface, this is very strong. I had to use some force to detach myself from the metal surface. It's a little tricky to pull, so I suggest tilting it sideways to pull rather than pulling straight vertically. As a side note, I accidentally dropped it on my iPhone X while writing this review (even if it was only for a second). The magnet didn't ruin my screen although I wouldn't recommend testing it lol.
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