100 pcs. 1/8" Cube Neodymium Rare Earth Block Magnets Very Strong! - N - 45
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100 - 1/8" Cube Neodymium Rare Earth Block Magnets Free Shipping on All Additional Sets! I have played with All sizes of these Super Strong Magnets I Must say that this Size is the BEST SIZE you can Buy! You Will have More Fun with These than any other Size! You WILL have Hours of FUN Doing Many Things. Please Read Hazards at Bottom Rare-earth magnet From Wikipedia, the free encyclopedia Rare-earth magnets are strong permanent magnets made from alloys of rare earth elements . Developed in the 1970s and 80s, rare-earth magnets are the strongest type of permanent magnets made, substantially stronger than ferrite or alnico magnets. The magnetic field typically produced by rare-earth magnets can be in excess of 1.4 teslas , whereas ferrite or ceramic magnets typically exhibit fields of 0.5 to 1 tesla. There are two types: neodymium magnets and samarium-cobalt magnets . Rare earth magnets are extremely brittle and also vulnerable to corrosion, so they are usually plated or coated to protect them from breaking and chipping. The term "rare earth" can be misleading; these metals are not particularly rare or precious [ citation needed ], and as of 2007 rare earth magnets give the best cost/field ratios of any permanent magnet. [citation needed ] Interest in rare earth compounds as permanent magnets began in 1966, when K. J. Strnat and
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