Material: Ceramic + Tungsten Steel + ABSSize: 20CM x 7.5CM / 7.9'' x 3''Color: BlackPackage Include: 1X Knife SharpenerProduct Features:1. Convenient to use, just place the dull blade in one of the sharpener slots and quickly pull the knife through times for effective sharpening.2. 3 stage to renew your knife, you will get a sharpened blade as sharp as new by using our Professional Kitchen Knife Sharpener within 10 seconds.3. Non-slip bottom to ensure you are in full control while sharpening.4. Made of solid ABS material, strong and durable.Caution:1. Please put the knife sharpener and knife beyond the reach of children to avoid and accidents.2. To avoid damaging the knife, please sharpen the knife slightly.3. Do not use the knife sharpener to sharpen serrated blades or scissors.3 Stages: Stage 1 - Preparation (High-grade Diamond rods). This 'roughens' the knife edge to prepare the surface for sharpening. It also smoothes any nicks and imperfections that could cause the blade to 'catch' during the sharpening stage (a common problem with 1 and 2 stage pull-through sharpening slots which can cause damage to blades). Stage 2 - Sharpening (Hardened Tungsten Carbide Plates) - Now pull the blade through slot 2's precision angled tungsten carbide plates to create the perfect sharpened 'V' edge on even the bluntest knife. Stage 3 - Hone (Ceramic Stone Rods) - For final edge honing. It removes any burs and gently polishes the blade edges for a super sharp polish.