Undoubtedly, this is one of the most awaited and renowned sharpeners from Fällkniven. A combination of diamond/ceramic sharpening stones that will cover all your sharpening needs. The new DC3 and DC4 sharpening stones consist of a fine diamond stone (25 microns) and a very special ceramic stone made of synthetic sapphires. The advantage of these materials, even though they wear down, is that they will maintain their flat shape, which is really important when sharpening your knife. And since these materials are the hardest we know, they will sharpen any steel, even these extremely hard powdered steels. No lubrication is needed for these stones, but you should occasionally consider cleaning them with warm water and liquid soap. The stones may seem rough at first, but they will become smoother/better after use. Leather pouch included.