I'd bet strong little magnets like that are
Neodymium, so be warned:
Quote:
Neodymium metal dust is a combustion and explosion hazard.
Neodymium compounds, like all rare earth metals, are of low to moderate toxicity; however its toxicity has not been thoroughly investigated. Neodymium dust and salts are very irritating to the eyes and mucous membranes, and moderately irritating to skin. Breathing the dust can cause lung embolisms, and accumulated exposure damages the liver. Neodymium also acts as an anticoagulant, especially when given intravenously.
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I've heard warnings from people who know that you are better off not being exposed to dust from drilling or filing the things.
As for weakening them,
this might help (but it's probably dangerous, so I'm not responsible, it's your choice, PBF takes no responsibility, yadda yadda):
Quote:
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These magnets ... are also mechanically fragile and lose their magnetism at temperatures above 80 degrees C.
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That's only 176° Fahrenheit, a temperature you can easily get in, say... your oven.
Now, if my assumption that they're neodymium magnets is wrong, well... ignore this post.

Also, I don't own an Ion, nor have I done anything but hold one in a store, so I'm in the dark on these magnets and their size.