moonfirespamAll I can find is that they label one side "coarse" and the other "fine." I guess that's simply stating the obvious, but judging by the picture I don't think you'd want to be using the coarse side on a regular basis. It looks pretty similar my 150 grit stone that I use strictly for reprofiling edges since it removes so much material.
I'd estimate the other side is somewhere between 400 - 600 grit, which is about what you'd want to get a nice "working edge," meaning plenty sharp but nowhere close to something you'd want to shave with ;) Personally, I'm an OCD knife collector who takes even brand new knives to the stone till they have a polished edge - finished on a leather strop. That way if you keep up with maintenance you really never need anything more aggressive than 800 grit to work back up to a mirror finish.