Everything comes from China products reviews site purchased in China
Neodymium magnets are great fun, great to experiment with magnetism with compasses or iron filings. This set of magnets, shown in the photo, consists of 100 8 disks each.
Are quite powerful, Glue and stick in metals with enough strength. It's a little difficult to separate disks, especially one by one.
In the picture below I put a 25 cents in back of 8 neodymium magnets. This distance is very close to the minimum that a magnet doesn't attract each other. The currency is just to give an idea of size.
Below one of the magnets on the minimum distance without being attracted to the currency of 25 cents.
The only bad thing about this package is that the magnets break very easily. The force of attraction is such that sometimes they break in half, as shown in the figure below:
Despite being pretty cool, I do not recommend buying this package. It's even cheaper, but the fact of breaking the disks is a little uninspiring. But those interested, I leave the link to the DealExtreme:
Very good your explanation.
Really, These Ímas are very strong. I found a good supplier in Brazil, the hint http://www.koimas.com.br
Hugs,