The brackets are made of permalloy. Im on my phone and cant cite it properly, but while being magnetic as steel, it blocks magnetic fields from penetrating through the other side of the bracket itself. So if theyre in a ball, they wont stick to things very hard.
I have about 50lbs myself, and wish i didnt have to sell them on ebay, but im running out of options
EDIT:
http://en.wikipedia.org/wiki/Permalloy
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