This sharpening stone is made of high quality corundum and has two kinds of grits in one piece for better sharpening. 3000 grits for coarse grinding and 8000 for super fine grinding. It is a perfect kitchen for cutting high quality kitchen, outdoor knives and other precise tools. Using this tool to make your knives sharp.Features:It is made of corundum and has a fine texture.It has two kinds of grits to choose: 3000 grits for coarse grinding and 8000 for super fine grinding.This sharpening stone features a soft, non-slip plastic base to ensure safe sharpening.It is a perfect kitchen for cutting high quality kitchen, outdoor knives and other precise tools.How to sharpen:1. Before use, please soak the sharpening stone in water for 5 minutes.2. Please do coarse grinding first, then turn to fine grinding to protect the knives.3. Wipe knives with a damp cloth or rinse them with water after sharpening, then dry them.Noticed:1.To protect the sharpening stone, please avoid falling from the height.2.Please put the sharpener and knife out of reach of children to avoid any accidents.Features:Material: CorundumGrit Type: 3000 and 8000 grit (Type 1)Item size: 18.5 * 6.8 * 3.2cm / 7.28 * 2.68 * 1.26inPackage list:1 * Sharpening stone