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Do not place magnets close to any source of heat, since you could permanently damage the magnetic characteristics.
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Do not place magnets close to audio or video cassettes, recorders, televisions, speakers, magnetic credit cards, compasses, watches, etc. You could irreparably damage them.
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Do not place magnets with the same polarity close to each other, the magnetic repulsion could damage the magnetic flow.
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Do not place magnetic materials that are different from each other next to each other (e.g. Neodymium with Alnico). The magnetic direction and the values might face substantial mutations.
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The use of permanent magnets is not particularly recommended for people with Pace-makers.
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Store the magnets in a dry environment far away from sources of heat.