Jense Quality Knife Sharpener. Two Stage Sharpening System. Tungsten Steel for Coarse Sharpening and Ceramic Rods for Fine Sharpening. 2 STAGE SHARPENING SYSTEM SHARPENS EVEN THE DULLEST KNIVES REALLY FAST by Sharpening both sides of the blade at once for a rapid sharpening process saving you time The coarse side has Tungsten Steel blades that sharpen the dullest of knives rapidly. Simply pass the knife though a number of times. Then the fine ceramic rods will hone the knife making it very sharp. TOUGH AND DURABLE. It will give you many years of great service. Tungsten is a very high quality metal that is very durable and highly resistant to corrosion The Jense Knife sharpener is beautiful and light weight. Has a comfortable handle and keeps your hand at a safe distance from the knife blade. Note, Jense Knife Sharpener is not designed for sharpening serrated blades or scissors.