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Magcraft Rare Earth 3/4 in. x 1/4 in. Disc Magnet (4-Pack) NSN0582 - The Home Depot
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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Super Strong Neodymium Magnet N42 4 x 1/2 x 1/4" Permanent Magnet Block, The World's Strongest & Most Powerful Rare Earth Magnets by Applied Magnets: Amazon.com: Industrial & Scientific