The pros all agree that Kuhn Rikon’s Dual Knife Sharpener is both safe and works perfectly. This knife sharpener features sturdy ceramic stones and functions remarkably well on straight knives as well as serrated. This sharpener from Kuhn Rikon comes equipped with a non-slip handle, and it will securely and conveniently store away until its next use. Slice through tougher cuts of meats, or dice potatoes faster and more efficiently using the Dual Knife Sharpener from Kuhn Rikon. To clean, wipe with warm soapy towel.