Used 1-2 times. 【Product Specifications】 ● Grinding Stone Material: Coarse stone - Diamond grinding stone / Finishing stone - Alumina ceramic grinding stone ● Body Material: ABS resin (heat resistant to 80°C) ● Transparent Lid Material: Polyester resin (heat resistant to 100°C) ● Size: W195 x D49 x H59mm ● Weight: Approximately 110g ● Country of Origin: Made in Japan (Tsubame-Sanjo), Sanjo City, Niigata Prefecture, Shimomura Kogyo 【Product Features】 ● This is an easy-to-use knife sharpener. ● Open the lid of the sharpener and add water to the main body (knife sharpening part). ● Hold the handle firmly and secure the main body. ● Sharpen the knife with the coarse stone and then the finishing stone. ● Move the knife back and forth about 10 times on each stone. ● After sharpening, discard the water, dry, and store. ● A guide is provided, so you don't need to worry too much about the angle of the knife. ● It is high-performance, used even by professionals.