Arkansas Sharpening Stone is the World's Finest Knife Sharpeners! Small, compact and very useful these pocket sized stones are convinient for a quick edge on the knife while you are in the outdoors, whether cutting twine or field dressing wild game. Size: 3" x 1" x 1/4" Different coarseness available: Extra Fine - Black Hard Arkansas - finish stone that polishes and razors out your blade to the highest level providing a razor edge that will last the longest Fine - Hard Arkansas - achieves a higher level of sharpening and begins to provide a razor edge Medium - Soft Arkansas - the best general purpose stone to achieve a sharp edge Coarse - Silicone Carbide - used to sharpen a dull or nicked blade fast