These very popular stones have medium grit for sharpening knives

the developer of Edge Pro Matrix diamonds

The convex edge of blades proved itself very well under shock loads

Warranty 1 year after the date of purchase

Since they don't break down themselves while sharpening the only mess is the water and swarf from your knife

jende resin bonded diamond Micron Grit:1 These very popular stones haveJende Resin Bonded Diamonds are used for sharpening knives on Hapstone, TSProf, and all Edge Pro compatible guided knife sharpeners. Diamond stones offer excellent performance in sharpening knives of any steel. Use a modest amount of water on each stone before using.