Naniwa Professional Stone, P390, grit: 10000

The Naniwa Professional-series is the improved version of the Naniwa Chosera Stones. Naniwa has renewed the binding agent of the water stones. It is unique that Naniwa itself takes care of the production of the binding agent. Optimal matching to the grit size is important. The result of this is that the sharpening properties of Naniwa water stones are significantly better than sharpening stones of other brands even though the grit size is comparable.