Review of Magcraft NSN0911 1/2-Inch by 1/2-Inch by 1/8-Inch Rare Earth Block Magnets, 10-Count

All of these Magcraft magnets deserve a 5 star rating for their strength and variations in design. Apart from that, be forewarned! These magnets are so strong they may cause some mischief. They are definitely not safe for small children. For example, I put one on the refrigerator but it was too strong to pull off. I had to slide the magnet over to the edge of the door to peel it off. But the magnet snapped around the corner and pinched my finger creating a blood blister. Also, contrary to the episode of Myth Busters, these magnets are in fact strong enough to de-magnetize the magnetic strip on your ATM card. I know this for certain because I unwittingly carried one of the larger magnets around in the same pocket where I keep my wallet. The next time I went to the store my ATM card would not work. So I tried my Visa card. It wouldn't work either. So these magnets are great, but use with caution!

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Product Description:
Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These block magnets are 0.500 inch (12.7mm) long, 0.500 inch (12.7mm) wide and 0.125 inch (3.2mm) thick. They are magnetized through the thickness. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Their individual pull force is approximately 6 lbs. Maximum working temperature is 176 F (80 C). Magnets may chip and crack if allowed to snap together.

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