VG-10 is high-carbon stainless steel containing cobalt, hard. The material has excellent sharpness and abrasion resistance. So it spread between the professionals. It is developed and made by Takefu Special Steel Co.,Ltd. It's Japanese company.
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\nIf the entire blade is very hard, it is difficult to sharpen. If the edge is soft, it is dull, and the sharpness falls immediately. So the hard material is used in the core edge only, the soft material is used in the side. VG-10 is hard, so Ceramic sharpening stone is recommended for speedy sharpening.