High-concerned chemical: NoneMaterial: OtherOrigin: Mainland ChinaConvenient to use: Quick, safe, and fits for right or left-handed operation with an ergonomic handle; Slip-resistant rubber bottom means your sharpener stays in place.Good quality: This knife sharpener made of PP+rubber+tungsten steel+ceramic+carborundum. It is durable and long lasting, keeping your hand safe when sharpening.Angle adjustable: Angle adjustment button 14 - 24 degree, so you can set the correct blade angle to sharpen knives of different size, thickness, and edges to their proper edge.Easy to use: Place the knife into the grinding groove at an prop angle to the sharpener, gently press down and pull back about 5 timesColor: As ShownMaterial: Polishing StonePackage Contents:1*pcs M 4-in-1 Knife SharpenerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.