Board for knives finish intended for blade cutting edge final honing. Put a paste for manual polishing on a soft side (usually it's green not depending on manufacturer, GOI polishing paste could be used). Knife polishing performed by forth motions keeping a sharpening angle. Glossy side used without paste or with finish paste (white). It is easy to make a knife sharp like a shave. The main thing is not to overdo and not to turn a cutting edge to a convex lens. In this case the knife will shave but not cut.