This is a combination bench stone produced in electric furnaces. This India stone is made of aluminum oxide and is brown in color. One side of this medium cutting rate stone is coarse and used to sharpen dull edges quickly, the other side is fine and is used to restore slightly dulled cutting edges and enhance the finish left by Medium and Coarse Crystolon stones. It's dimensions are 6 in. by 2 in. by 1 in.