Spyderco 303MF Double Stuff Sharpening Stone Ceramic Stone Sharpener Medium/Fine Black/White

The Doublestuff is the 303F (fine grit) and the 303M (medium grit) bonded together to create a tool with a variety of sharpening options. Use dry, without oil, water or lubricants and clean with a plastic scouring pad and powdered abrasive cleanser. This pocket stone is packaged in a leather carrying case. Made in the USA.