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In the market, the mechanical pencils and the refill boxes are separate. When supplying and replacing the refill, it's hard to put the refill into the mechanical pencil because the pen mouth is very small. And the refill is so fine that it is easily broken.The refill boxes are designed by the concept of bullet clip. The pen tube is made of recycled paper, and the spent refill box can be recycled, reducing the harm and pollution of the plastic on the environment. The avoid resource waste the refills can be supplied one by one so that once the refill is almost spent and normally too short to use, a new refill can be inserted on top of it.