Naniwa products belong to the top-class whetstones in terms of their sharpening properties. Super Stone S1 series stones are characterized by low wear and high sharpening efficiency, which is why they are also suitable for sharpening knives made of white and blue carbon steel, for example. Also, Naniwa Super Stone stones are very suitable for sharpening traditional Japanese knives such as yanagi, deba. The dimensions of S1 stones are 210x70x10 mm. Due to their large dimensions, they are also very suitable for sharpening longer knives. Super Stone S1 is a so-called "splash" type whetstones and do NOT need to be soaked in water before use. It is enough to sprinkle water on the surface of the stone before sharpening. Water can be additionally sprinkled on the stone during sharpening. Choose the right stone according to the situation of the knife being sharpened. To achieve the best result, it is recommended to sharpen the knife on 2 to 3 whetstones of different hardness. Coarse sharpening, restoration of blade nicks and blade geometry: #220, #400 Daily sharpening for dull knives: #800, #1000 Daily preventive polishing sharpening: #2000, #3000 Polishing after daily sharpening: #5000, #8000 Mirror polishing: #10000, 12000