Keokuk is a high quality stone from Oklahoma that has been heated to perfection. When heat treated red lines and speckles are brought out of the stone. Your purchase will contain 10lbs of premium (Grade-A) spalls that range from 4-7 inches long and are a great choice for the beginner to expert knapper. Stone shown in the picture is an example of what to expect. Actual pieces may very. Skill Range: Beginner to Expert.