Apparently a simple set of colored chalks, which actually embodies a small world Made in Japan.
Made in a remarkable factory on the outskirts of Tokyo, where people with intellectual disabilities manufacture this and other items in an environment designed for their specific needs, it includes several chalks (6,3xø1,1mm) each made from a mixture of calcium carbonate obtained in part from the shells of scallops collected off the coast of Hokkaido; a unique natural mixture that minimizes the dust and let them last twice as long compared to normal chalks.
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