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This is a convenient refillable ball pen, the pen body forming one, save the pen than in the past a number of structural elements, saving material. Pen only open the whole side of a small trough, it is higher than the standard pen refills smaller diameter can be inserted to ensure the cartridge will not slide out. Written in the standard cartridge slot design of the card in the pen firmly within. Double hollow end of the design document to facilitate the replacement cartridge.
Mengxue Xia, Xiaozhong Huang, Yipeng Wang, Yanchun Lv