As I use the Paper Wheels to sharpen my knives, the grit on the wheel is 180 I believe. Sounds coarse, but with the applied wax to keep the blades cool while sharpening, it seems much finer. No sparks when using with light pressure. Gets you where you want to be with a minute burr very quickly and with little loss of blade steel. Strop it on the slotted wheel loaded with compound and you are ready to shave hair and push cut phone book paper. 3 or 4 minutes tops and your done.
Blessings,
Omar