I've had and used many many neodymium magnets in the last 20 years. They're all great and strong always, and so are these. They are all also inherently fragile and obviously drawn to eachother. These are so thin that they break very easily on impacts. Totally understandable. Sometimes you just need thin magnets like theses and these are great for the job. Just be extra careful with them obviously. Try to slide them on to your metal surface from the side/edge as opposed to just plunking one on the surface, or you will more than likely shatter it
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