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Clever Lead / Automatic pencil lead

Clever Lead

The pencil lead is colored at the end.
You will find out when it is going to be refilled according to the color, thus avoiding the situation of pencil lead shortage.

University

Jiangnan University

Jiangnan University
Wuxi, China

Design

Jiangnan University

Jiangnan University
Wuxi, China

Shan Lei Xiuqi Wu Zhicheng He