it basically cointains the magnetic field, the magnet that is glued onto the motor, is glued down in reverse polarity, somehow, the magnets fighting to repel each other will keep the magnetic field small enough so you can place then near magnetically sensitive items ie:tvs, pc monitors, credit cards, ect
(if you dont know, if you place a magnet by a tv or monitor you will get crazy rainbow trippy effects) but it will FU*K UP YOUR TV!!
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