ThCuisine::pro® iD3® BLACK SAMURAI 3-Step Sharpener features a precision system with a diamond wheel to prep the blade, a tungsten steel blade to sharpen, and a ceramic wheel to polish. It also includes a dedicated sharpening slot for kitchen shears - ensuring every edge in your kitchen stays razor-sharp. 3-Step Sharpener features a precision system with a diamond wheel to prep the blade, a tungsten steel blade to sharpen, and a ceramic wheel to polish. It also includes a dedicated sharpening slot for kitchen shears - ensuring every edge in your kitchen stays razor-sharp. The blade is made from Japanese stainless steel 420J2, measured at 53 on the Rockwell hardness scale. Handle construction: One-piece seamless stainless steel (asymmetric hollow, MicroDot®). Hand wash with mild soap and warm water, then rinse and dry immediately. Do not place in the dishwasher. Backed by the Cuisine::pro lifetime warranty. Recommended uses: Maintaining Knife Edge.