Arkansas Novaculite, mined in the Ouachita Mountains, is recognized around the world for its ability to sharpen knives.  These pieces are small enough to carry in your pocket or purse and provide a sharpener no matter where you are at the time. Medium, otherwise known as soft Arkansas, is a general purpose stone that achieves a nice edge on your blade. Fine, also known as hard Arkansas, is the stone that will begin to make your blade razor sharp.