Genuine Arkansas Black Surgical (Ultra Fine) Pocket Knife Sharpening Stone Whetstone 3" X 1" X 1/4" in Leather Pouch Bap-13A-L Black surgical Arkansas pocket sharpening stone is 3 inches long by 1 inch wide by 1/4 inch thick This is the hardest of the Arkansas stones and will hone a polished, very sharp razor sharp edge Color can vary from dark grey, to blue/black to black. Genuine Arkansas stone is 100% quarried in the Ouachita Mountains of Central Arkansas Come in a leather pouch to protect when not in use.