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Amazon.co.jp: Neodymium Magnets, 10 Pieces, 0.4 inch (10 mm) Diameter, Round Neodymium Magnets, 1/1.5/2/3/4/5/6/8, 10/15/20, 30mm Thick Rare Earth Strong Craft Permanent Magnets N35, Strong Rare Earth Magnets (Color: 10MM X 30MM) : Office Products
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