Incredibly strong magnets that attract metal from a distance of up to 10 cm! I use them to attach my art supplies to my metal board. However, as they are incredibly strong, removing the magnets is not easy and I found I had to slide them off the edge of my metal plate and be very careful that there was no other metal nearby that could cause further sticking. They hold the environment I'm working on, nothing moves, but damn it's a pain to take them off. Also, you have to keep them away from each other otherwise it will be very difficult for you, I mean very difficult time, to separate them. I used the swipe method but because they are small it is difficult to hold them in your hands.
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