Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
The sharpener does not throws away but keeps the powder of the carbon in the container,which mimics the sandglass for recreation and timing when studying.
Zhejiang University
Hangzhou, China
Hangshuai Wei
Zhejiang University
Hangzhou, China