Sigma Power

Sigma Power, the sharpening stone manufacturer in Japan, has designed these premium stones especially for tough-to-sharpen high alloy steels. Sigma Power is not exactly a common name outside of Japan, they are held in high regard with their rapid sharpening and ease of use. When using these stones, one can easily see it working, and they have a feel while sharpening remarkably like a natural water stone. In contrast with resin-magnesium or cement bound stones, these Select II stones have no binding material.