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Wood is the main material of the pencils.The “wood-saver” sharpener can save woods by changing the shape of the head of the pencils. The wood we save from one pencil is not so much, but if every one of us uses this sharpener, the effect will be obvious. There will be a lot of trees to be saved every year.
Polytechnic University of Turin
Shen Yue Liu Yuanyuan