This Sharpener By Kasumi Enables You To Sharpen Even Ceramic Bladed Knives, Which Are Second Only To Diamonds In Hardness. It Is Simple And Easy To Use. It Features Two Wheels, One Is A Ceramic Whetstone Wheel While The Other Is Diamond. Use The Diamond Stage For Your Fine Ceramic Knives, And Use The Whetstone For Your Japanese Style Metal Blade Knives. It Uses Water For Lubrication, And Is Easy To Clean. Use This Sharpener With Your Kasumi Brand Knives, And Any Other Slim Japanese Style Blades. Not For Use With The Broader European Blades. Made In Seki, Japan. This sharpener by Kasumi enables you to sharpen even ceramic bladed knives, which are second only to diamonds in hardness Simple and easy to use. It features two wheels, one is a ceramic whetstone wheel while the other is diamond Uses water for lubrication, and is easy to clean Use this sharpener with your Kasumi brand knives, and any other slim Japanese style blades