Spyderco 303MF 1 by 5 DoubleStuff Sharpening Stone Medium Fine Sided and Includes Protective Case 303MF

The Double stuff is a 303F and 303M bonded together and packaged in a leather pouch offering a variety of sharpening options. This pocket stone fits in the palm and has both medium and fine grits packaged in a leather carrying case. It is autoclave safe (ideal for dental tool sharpening) or can be cleaned with a plastic scouring pad and powdered abrasive cleanser.