These sharpening stones are made of high quality diamond material and are durable enough to last for years. The high-strength body gives the stone better durability, making it thinner and lighter. Multitasking Knife Sharpener - This set contains 4 different types of grits to meet your various sharpening needs, such as kitchen knives, carpenter tools, ceramic knives, chisels. All stones have a honeycomb design layout for efficient sharpening. EASY TO USE - The sharpener has a non-slip base for easy control and use. It has a 5.9x2.5 inch face and a wider blade for specific shape tools. Do not put it in the dishwasher or immerse it in water. Sturdy and Drinkable - Due to the increased hardness, the sharpener can be made into a thin and light body. Compared to other stone sharpeners, these diamond sharpeners are very portable and easy to store in your bag. Colour:silver Material:diamond Size: 150 x 63 x 3mm Package Contents: 4 x diamond sharpening plates