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Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.
What reviewers say. More than 5,000 shoppers have given this gadget a five-star rating. "This product is amazing. I was a bit skeptical at first but it really helps in getting a deep clean.