•Instructions for use:1. Soak the whetstone in water for 5 minutes, then place it on a sturdy surface, such as a table or desk.2. First use #3000 grit surface for rough grinding at an angle of 10~30 degrees, push the knife out forcefully, and then gently retract it. This process takes about 15 minutes.Then use a #8000 grit surface for fine grinding. This process takes about 10 minutes.4. After sharpening the knife, wipe the knife clean with a damp cloth or water, then dry.5. Clean the whetstone with a soft brush and dry in a ventilated place.Material: white corundumColor: light green + whiteSize: 18*6*3cmWeight: 19.75 oz.