This Two-Sided Whetstone Has Both Fine (3000 Grit) And Super-Fine (8000 Grit) Grains For Sharpening And Polishing Knife Edges. The Stone Is Suitable For Use With Either Water Or Oil.brDimensions: 6"L × 2"W × 1"HbrMaterials: CeramicbrProduct Of GermanybrSubmerge The Stone In Water For About 5 - 10 Minutes. Continue To Apply Water While Sharpening. The Stone Releases Small Particles During The Sharpening Process; This Powder In Combination With Water Allows The Sharpening. Place The Stone On A Slip-Resistant Base Like A Towel. Start By Using The Coarser Grit Of The Stone. Move The Blade Back And Forth At An Angle Of 10° - 15° Using Gentle Pressure. Start At The Tip Of The Blade, Continue With The Middle Section, And Finish At The End Of The Blade. After A While You Will Notice A Small Burr At The Edge. Now Repeat The Same Process On The Other Side Of The Blade. Finally, Turn The Stone Over And Repeat The Procedure, This Time Using The Finer Grit Of The Stone. In Order To Remove The Remaining Burr, Pull The Blade At An Angle Over The Stone. Now You Will Have Achieved The Best Sharpness. Rinse The Stone And Clean Off The Grinding Residue. Clean Your Knife With Hot Water.