Finding the right magnets for my craft was like three bears. I needed small magnets strong enough to easily pull through two pieces of felt but not so strong that they could pull things and hold things together tightly. After a set that was too weak and a set that was too strong, this was exactly what I was looking for. They are not polarized so both sizes attract each other. And I didn't have the black spot issues that other reviewers complained about. After working with them quite a bit, I haven't had any black marks on my hands, and they didn't leave a mark on even the lightest felt. I'm so glad I finally found these magnets!
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