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They have a high magnetic field strength and have a high coercivity (which makes them magnetically stable). The magnets have a curie temperature of 80 degrees Celsius. They are plated to protect them from corrosion.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.