Kasumi Knives are produced by the Sumikama Cutlery factory in Seki Japan. Sumikama specializes in producing knives from the most advanced materials, with the most advanced manufacturing techniques. Kasumi Sharpening Accessories are designed specifically for use with Kasumi knives, but can be used for any Japanese knife brand. Always follow the sharpening instructions on the packaging. #600/1000 Combination Ceramic Whetstone #600 Grit is Perfect for restoring the edge of a dull blade #1000 grit is the most commonly used grit to sharpen and hone blades that become blunt A rubber base to hold the whetstone and prevent slippage is included Use this sharpener with your Kasumi brand knives, and any other slim Japanese style blades Made in Japan