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People always forget take an eraser or easy lost the eraser.If use the pen have an eraser on it,It is not convenient to turnover to other side to use the eraser, Eraser pencil combining eraser and pencil together. Use eraser encase pencils body. We can use it as an eraser as long as slopes downward based on write gestures. Rubber material shell protect lead core not easy break up.
Ruodan Chen Lihao Zhang