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In daily life, almost all penstocks are discarded when the ball pens are exhausted, its really waste a lot.
The original idea of Pen Core is from no waste. The traditional ball pen is designed into a new no-barrel one, the whole body of which is a spiral line, saving the barrel and extending the refill.
When Pen Core is produced, the tail part of it can be made into some interesting shapes.
Pen Core is a design which simplifies the ball pen structure, saves producing materials and provides fun for users.
Wang Lijue, Yao Xixi, Pan Yue, Shi Lei, Wang Jiaolong, Ying Fangtian(Tutor)