These magnets are not strong at all. I used a 1" x 1" magnet mounted vertically on the wall. It will not hold an 8.5" x 5" sheet of paper with a larger paperclip. The magnet was barely strong enough to hold the paper clip. I guess I'm just used to strong rare earth magnets. The only thing I can say is that they feel stiff and don't bend or twist.
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