It is easier to understand than ordinary chaco as powdery. However, in this summer the core is soft and decreasing is very fast. It is even better if there are variations in the hardness of the core like a normal pencil.
Everyone in the factory uses it. At one time a worker brought this and came to buy it at the opportunity because he said "Please buy it at the company because it is very good." Unexpectedly spread within the company. When I was out of stock the other day, several people asked me "Are you still?" I will continue to use it from now on.