The Doublestuff from Spyderco features medium and fine-grit stones permanently bonded back to back for the ultimate in versatile field sharpening. This pocket stone fits in the palm and comes with a convenient leather carrying case.Use them dry, without oil, water or lubricants. For cleaning, scrub with a scouring pad, powdered abrasive cleaner with water, and let them air-dry. Stones are autoclave safe.FeaturesVariety of grit optionsLeather carrying caseFits comfortable in you palm