This is a combination whetstone. Made in Japan. Domestic product. Double-sided whetstone #1000 #6000. For home use. With non-slip base. For medium grit and finishing sharpening. 205mm x 75mm x 35mm. Includes a sharpening mat. This is a double-sided whetstone (combination whetstone) that combines a frequently used medium grit stone (#1000) and a finishing stone for when you want to improve sharpness. When using knives at home, there are times when the sharpness decreases. For example, when cutting tomatoes, they get slightly crushed, or the skin of chicken is difficult to cut. That's when it's time to sharpen. First, sharpen with the medium grit stone (brown side / #1000), then sharpen with the finishing stone (whitish side / #6000). You can get a sharp edge with just the medium grit stone, but even a few strokes on the finishing stone will change the sharpness. The good thing about this whetstone is its width. Because the area of the knife blade that touches the whetstone is wide, you can sharpen efficiently. How to use: 1) Place a non-slip mat or cloth under the whetstone to secure it so it doesn't move. 2) Pour plenty of water on the whetstone and make sure the entire surface is wet. *There is no need to soak this whetstone in water to absorb water. 3) Start sharpening your knife. 4) After use, drain the water and dry it in the shade before storing. Thank you for viewing. Although there is some blackening due to use, there is no problem with its use. The outer box has only the lid due to dirt. Retail price: 4820 yen.