Restore Blunt Knife Edges Quickly The Naniwa Chocera Pro sharpening stone (grain 400) is perfect for restoring the edge of blunt or damaged knives. Ideal for knives that haven't been sharpened in years, this stone ensures quick and efficient edge restoration. Naniwa Chocera Pro Collection Previously known as Naniwa Chosera, this series maintains its renowned quality with updated packaging. How to Use Naniwa Chocera Pro Stones Made with bound magnesium, these stones require minimal water. Simply add water before use and dry at room temperature after. Store in a dry, dark place to prevent cracks. Grain Size Guide: 200-600: Restores blunt edges 800-1000: Maintains sharp knives 2000-3000: Sharpens beyond initial sharpness Ensure proper storage to prevent cracks and extend the life of your stone. In the Box 1 x Naniwa Chocera Pro Sharpening Stone Grain 400