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Fibers reflect light in two ways and thus present two colors when put back and forth. Such makes it possible for children to write and draw on fiber surface. Not only is this fiber writing pad economic for that no consuming product is needed anymore, its also quite safe for children since it has no hard corners. One can roll it up and carry it to anywhere.
Jia Rao Yanlin Li Weiyu Ruan Xiao Luo