20 PCS Super Strong Neodymium Magnets 1-1/16"x1/4" Cylinder Magnets N45 Powerful Permanent Rare Earth Magnets Cylinder Rod Magnetic Pins for Multi-Use Science DIY Craft and Office Magnets, 27x6mm: Amazon.com: Industrial & Scientific
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CMS Magnetics® Super Strong Neodymium Magnets Ring N45 1-1/2"OD x 1.065"ID x 3/8" - Rare Earth Ring Magnet - Science Projects School and Magnetism Education: Amazon.com: Industrial & Scientific
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