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The unique pen cap’s edge design can make it perfectly fit with both the papers and tables.Its similar triangualr prism moudle with scales like a dividing ruler.Pen cap is an integral part of ruler.And with such design,people can use it as a ruler anytime anywhere.When one runs out of the ink,one can throw the pen body away and collect the pen caps and inset them together to become a longer ruler.Thus the garbage is change to cowry.
Guangdong Ocean University