This 3" x 8" Benchstone sharpening stone is another fantastic piece from Spyderco featuring a double-sided aggressive Cubic Boron Nitride (CBN) abrasive. One side has 400-mesh CBN and the other side has 800-mesh CBN that both are ideal for putting a sharp edge on any knife. It includes a brushed suede storage pouch. It is important to use this stone with light pressure and it can be cleaned with a brush or soft cloth.