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Because of the need of space we grab pens, the size of pens is big and we can't put too much pens in pencil cases. The real size of pens only depends on refills inside. Flexible Pen is a ball-point pen with memory metal, and it can change in 2 types. When put in cases, it wiil shrink to thinner size. And when we use it, just press the head and it will expand to thicker size, which allow us to grab it suitably.