tilraunakenndur Fara fram úr Dauður í heiminum neodymium ring magnets klút postulíni námskrá
CMS Magnetics® Grade N52 Super Strong Neodymium Magnet Ring OD1.26" x ID 1/2" x 3/8" - Rare Earth Magnet Ring for Classroom, Science Project and DIY Applications - One Pack: Amazon.com: Industrial
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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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3" x 2" x 1/2" Ring - Neodymium Rare Earth Magnet, Grade N48: Amazon.com: Industrial & Scientific
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Strong N52 Neodymium Magnet 1.26 in OD x 0.5 in ID x 0.25 in Ring