1. [Usage]: Just put the blade into the slot and pull a few times, the knife will be sharp, convenient and safe. (Note: can only be pulled backward, not forward) 2. [Material]: The whole is made of plastic, rubber, tungsten steel, ceramic, different materials used in different locations to achieve different purposes. 3. [Use]: This sharpener is suitable for slicing knives, machetes, paring knives, fruit knives, stainless steel knives. 4. [Hygiene and Health]: The sharpening head of this knife sharpener can be removed for easy cleaning, keeping it clean and hygienic for you and your family. Product Name: Knife sharpener Product material: stainless steel + PP Product Size: 22*5*6*8.5cm Packing list (you can get after buying a product): knife sharpener X1 2. Due to manual measurement, the size may have 1-3cm error. 3. 3. Colors may vary from monitor to monitor.