DMT - Diamond Mini-Sharp Knife Sharpener - Green (Extra Fine)

These slick little diamond stone sharpeners from DMT are the cats pajamas. These sharpeners fold up into a portable, pocket-sized form factor that can travel anywhere. They even tout themselves as "The world's best diamond surface for sharpening tools & knives". Extra Fine diamond stone Portable keychain enclosure Sharpen dry or with water - no oil required