Come and see our amazing products. The sharpening stone is made of environmental protective material which is non-toxic and safe.The sharpening stone is portable which can be easily carried when you go out for camping or other outdoor activities.The cutten device stone is very practical for your kitchen which will make your cutten device sharper. It is durable and you can use it for a long time . Made with high quality materials, knives will work like new. Easy to use, insert knife blade into the V-shaped slots at a 90-degree angle to the sharpening blades or stones, pull the knife blade straight back towards you while applying light pressure, repeat this action until blade is sharp. Pls confirm with us about the packing info, stock color and exact production time before placing your order.