Spyderco’s medium-grit (brown) ceramic pocket stone is compact, lightweight, and ideal for touching up edges in the field. Description . Technical Specs . Quantity . Free shipping for many products! Made from ultra-hard alumina ceramic material, Spyderco's ultra-fine-grit benchstone is used like a traditional sharpening stone, but does not require oil or water. Find many great new & used options and get the best deals for Spyderco Ceramic Bench Stone Medium Grit Sharpener 302M at the best online prices at eBay! It comes with a protective suede carry case that doubles as a non-slip base during use. Available in Medium (pictured), Fine or Ultrafine grits, each 2" x 8" x 1/5" stone comes packaged in a rigid polymer storage case complete with non-skid rubber feet for tabletop use. Pocket Stone Medium 1X5 . As with all of Spyderco's ceramic stones, use our benchstones dry without lubricants or oils.