very strong and they worked flawlessly for my project

Nice and strong. I didn't need the 3M adhesive circles as I was gluing these on stones to make (strong!) refrigerator magnets, however, it is very nice to have them if you do need them. They came in a small plastic case and if you let them snap together quickly they can break. They may seem like sturdy metal, but they are in fact fragile. Overall though, very strong and they worked flawlessly for my project. As you can see in my picture, one magnet was able to hold up 25 sheets of standard printer paper on my refrigerator.

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