Genuine 3 Stone Arkansas Full Size 4" Tri Hone Whetstone Knife Sharpening System with Silicon Carbide (Coarse), Soft (Medium) and Hard (Fine) Stones 4" X 1" X 1/4" TRI-4 3 Stone Model has Coarse (Silicon Carbide), Medium (Soft) and Fine (Hard) Stones 3 stone sizes are 4 inches long by 1 5/8" wide by 1/2 thick Comes with one ounce of honing oil Genuine Arkansas stones are 100% quarried in the Ouachita Mountains of Central Arkansas Comes with 23 degree sharpend guide and wood base