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You can have weak (magnetically) and durable magnets or strong and brittle magnets. These are the latter of the two. To get an idea of how strong these magnets are, I was doing a little test with them. I put one of these small magnets (only half inch in diameter) on the table and held another one vertically above it. I kept lowering the magnet until it was about 3" above the one on the table when it jumped of the table and smashed into the upper one. After doing this twice, both magnets split in half from the stress. To compensate for their brittleness, you can coat the magnets in 2 part epoxy resin without losing much magnetism. Overall great magnets!
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