Monzento is a medium grit natural stone. It is similar to Aoto, but a little softer and more muddy in general. The finish is about 3000-4000 grit and is leaves a very even finish with great contrast. Some knives, such as deba, can be finished on this stone. In my personal sharpening lineup, I use a stone like this on almost all wide bevel and/or single bevel knives. I usually follow this up with a finishing stone. I have found it to be one of the most useful stones for single bevel and wide bevel sharpening.
*The stone pictured is just a sample. Actual stones will vary in size, shape, color, etc.