0ur opinion:

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Rare earth magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. These countersunk ring magnets are 0.750'(19.1mm) diameter x 0.200'(5.1mm) inside diameter x 0.125'(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 5.8 lbs. Maximum working temperature is 176 F (80 C). Magnets may chip and crack if allowed to snap together.

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• MAGCRAFT® Magnets - 1/2" x 0.150" x 1/8" Rare Earth Ring(Countersunk), Package of 12
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Buyer's feedback: - * Magcraft Magnets ...
I bought these to use as fancy fridge magnets and they look great. As a science teacher I've bought Magcraft magnets before, but these ones are mega strong!

They are separated in the package by plastic spacers - I removed one only to have the next magnet slam into the next with tremendous force, jamming the edge of my finger and giving me a blood blister! Their holding power is astonishing and they are very hard to get apart (slide and rotate apart).

One warning, these are sintered magnets which means they are made of finely sintered metal with a metal coating - they are not solid metal! My sister in law accidentally had one smash into the other and they both split in half with the force of the attraction. Not a toy!

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Buyer's feedback: - Not for children.
These magnets are great! They will jump out of your hand and smack together and could chip the nickel plating so be careful with them if you want them to stay pretty. Strong enough to damage CRT monitors and other electronics. Not recommended (by me) for children without supervision. Perfect for picking up metal objects, perhaps too much for sticking pictures to the fridge. Will hold up a 12 month calendar with no problems.

You can do crazy stuff with a little imagination. Don't do the "magnetic ear ring" thing with these because you won't do it twice. Take a fool's advice and trust me on this one.

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Buyer's feedback: - * Magcraft Magnets 3/4\" ...
These magnets are very very very powerful. Unbelievably strong. I would get the smaller size next time for attaching things to refrigerators or bulletin boards.

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Buyer's feedback: - like little black holes!
These little magnets are incredible. They are like little black holes that suck anything metal towards them. I put one of them on the end of a small dowel. I use it to remove nails from the ashes in my woodstove. Some of the wood I burn has nails in it, and it was always such a pain to sort them out of the ashes. If you have need of small magnets these things are great!