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The electromagnetic concept“Like poles repel and opposite poles attract”is the core theory involved. The exterior of the pen is made of positive charge magnets and should be together with the bracelet., which also has a magnet positively charged. For people with hand tremors, when they write and the pen falls back because of the shaking, the magnets will come into use by repelling, keeping a certain distance between the pen and bracelet., allowing the hand to hold the pen more firmly.