Genuine Arkansas Black Surgical (Ultra Fine) Knife Sharpening Bench Stone Whetstone 6" x 3" x 1/2" in Wood Box BAB-632-C Black Surgical Arkansas sharpening stone is 6 inches long by 3 inches wide by  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 fitted wooded box to protect when not in use.