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Every year lots of trees are cut down. The preservation of timber resources becomes more and more important. It is very pleasant to draw. But when the brushes are broken or damaged, we tend to throw away all the brushes away. When we apply some changeable brushes, the pen can be reused. We can save the wood and protect the environment.
Zhengzhou University of Light Industry
Zhengzhou, Henan Province, China
Yifan Wu,
Zhengzhou University of Light Industry
Wenqi Zhao,
Zhengzhou University of Light Industry
Delong Geng,
Zhengzhou University of Light Industry
Yunbo Wang,
Zhengzhou University of Light Industry
