The Fallkniven FDC is a foldable diamond & ceramic knife sharpener. One coarse diamond side at 25 micron and one very fine ceramic side at 9 micron.

As knife steels improve becoming both stronger and harder, even greater demands are put on the tools we use to maintain these knives. Based on our long experience of extended periods living in the woods, we believe that the diamond sharpener is the absolutely best tool for standard knife sharpening. Even if a diamond whetstone gets worn, it remains flat and that is a great advantage in the long run when sharpening knives. Additionally, the diamond whetstone is quick in its action, you get a new edge very fast. No oil or water is needed either. The yellow surface consists of titanium aluminium nitride which greatly prolongs the life of the sharpener.

Use the yellow diamond whetstone (25 microns) in forming a new, thinner edge, the white ceramic whetstone (9 microns) for polishing the edge. You can polish the edge several times before you start using the diamond stone.

The whetstone comes with instructions. For cleaning, use some washing-up liquid and hot water. Regarding cleaning the ceramic stone, try an eraser or warm water and some washing-up liquid. Like all diamond sharpeners, this whetstone is a bit rough at first but gets smoother after a period of use.