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People usually need needed a variety of pen pen in their daily lives.Alter-pen is a multi-functional pen with alternative head. Only one pen can meet peoples different need. Meanwhile, Alter-pen is green and saves the resource. When you want to change the head, you just need to press the button on the pen , and put the pen into the empty socket, then the body will separate with the head, after that you can choose the head you want to use and enjoy it.
Shaodong Jiang. Wei Lin. Fang Song. Yanfei Tian.