High-concerned chemical: None Material: Other Origin: Mainland China Convenient 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 times Color: As Shown Material: Diamond Package Contents: 1*pcs M 4-in-1 Knife Sharpener Only 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.