This model is palm sized and sold individually in a medium or fine grit. Portable and versatile, Spyderco manufacturers a variety of small pocket stones for field use and for honing small items. Each stone is sold separately, packaged in a leather carrying case and is sterilization/autoclave safe (great for dental tool sharpening).
The 303M Fine Grit Pocket Stone fits in the palm and is 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.