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The Gesshin™ 400S Sharpening Stone is great coarse stone with very good cutting speed. Speed-wise, it fits between our Gesshin 220 and Gesshin 400 grit stones. The actual grit is more like a 320 grit stone. It has a very grabby, aggressive tactile feel. It is a little bit better at resisting dishing than our Gesshin 400 stone. However, it also leaves deeper scratches. It works well on all types of steel I have tested it on, from simple carbons, to the most high tech and hard stainless steels. It cuts very quickly and leaves a very even finish. I have no problem jumping directly to a medium grit stone (1000-200 grit) directly from this stone. This stone needs to be soaked at least 15 minutes before use (just until the bubbles stop coming out of the stone). I leave mine in water all of the time, so it is ready to go whenever I need it. If you do leave your stone in water, please change the water regularly. When drying out this stone or any others, do so out of the sunlight in a well-ventilated area.
This is a vitrified stone.
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Length: 205mm
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Height: 23mm
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Width: 73mm
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Weight: 849g