For single-edged knives. Unopened, brand new, unused. I am selling this because I accidentally purchased it. ■ Sharpens with a combination of diamond and ceramic whetstones. Easy to sharpen, making it very convenient for everyday use. ■ Revives the sharpness of Japanese knives in three steps. ■ The whetstone part fits inside the cover for compact storage. ■ Specifications ■ Size: 11.7 x 4.5 x 5 cm Weight: 111g Material: Body/ABS (Acrylonitrile Butadiene Styrene) resin, Transparent cover/AS (Acrylonitrile Styrene) resin, ABS (Acrylonitrile Butadiene Styrene) resin, and elastomer resin, Whetstone/Diamond whetstone and ceramic whetstone Country of origin: Japan