Those magnets look like what would be found in kitchen cabinets or such.... or not too far from them. Probably stronger than the kitchen type though.

I found that if you take any old hard drive that doesn't work any longer (and is out of warranty), tear it open, the magnets used by the controller and heads are INTENSE! Gotta watch where you put them down, if there is metal nearby they are taking off for it or the metal part is coming to them! (well, maybe not that extreme, but y'all get the point)

TX-Deck