We bought these guys because we were tired of picking up cut outs every time we close the fridge door. I thought we needed rare earth magnets to keep this from happening all the time, but these magnets seem strong enough for even thick paper (like cardboard). I can't say how long they last, but I can say they're good for more than just crafting. Your fingers and any surface you can stick to. The tags don't seem to be permanent, and unless you have important documents or priceless photos, I doubt they'll cause any problems. A pack of 25 seems perfect for our standard fridge, but if you
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