Made of the same ceramic material of the famous Triangular rods, this is a fine ceramic bench stone. While many manufacturers use the terms fine to mean a rather medium level of grit, the Spyderco Fine is more comparable to other stones described as extra fine or even a little finer. The ceramic sharpening surface is very hard and durable. These ceramic stones are to be used dry (no oil or water). Cleaning is easy, just use a plastic abrasive pad and powdered abrasive cleanser. Stone measures 8" x 2".