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Everytime when the pencil was finished to about one third. it become notcomfortable to use anymore.but Relay
Pencil here solved this problem,all the pencil was settled by the effect of convex-concave,when the pencilstart
not easy to hold anymore ,you can put it on the tail of a new pencil,so that people can continue using it comfortably
Yanshan University
Qinhuangdao City, China
Yanshan University
Qinhuangdao City, China