Material: Made of ABS plastic, strong and durable. The grinding tank is composed of high hardness ceramics, tungsten carbide and diamond. Anti-slip: The bottom of the knife sharpener is covered with anti-slip pads to prevent slipping during use. Level 4 Knife Sharpening Tools: Professional knife sharpeners can choose corresponding sharpening grooves according to different needs. Slot 1 has a coarse diamond strip for duller knives. Slot 2 has a tungsten steel bar for daily sharpening to sharpen the edge. Slot 3 has a ceramic rod for polishing the edge to remove small burrs. Slot 4 is equipped with a ceramic rod for sharpening. EASY TO USE: The kitchen knife sharpener is suitable for both left-handed and right-handed users. And you don't need to be professional and have a lot of strength, just put the knife in the sharpening slot, then pull the blade back several times in one direction, the sharpness of the knife can be restored in a few seconds.