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As usual, you use magnets. When the magnets approach to metals, they will be mutual attraction. According to the concept, our knife has a metal knife, magnet inside and one piece of pad is for cutting having magnetic. If you only take knife, your knife can not be used. Consequently, your body wont be hurt!
The other different of this knife is the part near knife that is transparent. Thus, we can see the paper more apparently and directly.