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CMS MAGNETICS - Rectangle Neodymium Magnet Bar (1 ct, 3” x1/2" x1/4”) - Rare Earth Rectangle Magnet for Crafts, School Projects & Magnetic Therapy, Pack of One Rectangular Neodymium Bar Magnet: Amazon.com:
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Magnet Grades Neodymium magnets come in different grades such as N42, N52 or N42SH. What do these numbers mean? How does the grade relate to the strength of a magnet? Does a
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