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4mm dia x 0.5mm thick N42 Neodymium Magnet - 0.14kg Pull
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200Pcs N52 Mini Small Magnet 4x0.5mm Strong Round Magnets Dia 4*0.5 mm Neodymium Magnet Rare Earth Magnet Precision Small - AliExpress Home Improvement
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Amazon.com : The Magnet Shop 10 Magnetic Sheets 0.5Mm for Spellbinder Dies Craft Strong Thin & Flexible A4 : Arts, Crafts & Sewing