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可削出不同笔尖的削笔刀 / Tips-changing Sharpener Pro

可削出不同笔尖的削笔刀

Tips-changing Sharpener Pro is able to change the angle of the blade pencil sharpeners.By changing the angle of the blade so that can make different tip of a pencil, so it can satisfied different need of functions and different preferences of users using.
The blade angle becomes smaller, the tip becomes sharp and long,tip can burn longer and thus reduce frequency of using sharpener ,but will increase the consume of pencil
The blade angle becomes larger,the tip becomes shorter,it will reduce the consume of pencil that every time you use sharpeners , but the tip can be consumed faster thus increasing the frequency of using sharpener

University

Nanchang University

Nanchang University
NanChang, China

heqi zhao,
Nanchang university

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