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In daily life we usually throw away the short pencils because they are difficult to hold ，even though they can still be used. Pen Cap is a connector of two pen . It has two open sides for pencils to put in. Pen Cap enables the short pencils to be used for a further time so that all materials could be used up as much as possible .The concept has advocated the Low-Carbon life and the frugal lifestyle.
Qian Manqian,Xu Sisi,Yuan Sisi,Shao Shiyi,Wu Fangyuan,Luo Zhening,Ouyang Chenglin,Sun Xin,Chen Si,Pan Yu,Lin Zhenyu,Chen Fan