These magnets are really great - I used them to hang an art installation in a gallery and they were more than strong enough to attach poster board and acrylic to a magnetized surface on the wall. Since then, several magnets have found their way into my fridge, where I now have a stack of coupons. I will definitely buy them again. For reference, they're somewhere between a quarter and half a dollar in size and light in weight. If you use them as a temporary attachment point like I did, you can simply attach them to the object with thick adhesive tape.
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