My experience has taught me that even 180 isn't sharp enough to cut. I only use 180 to remove the 80 or 120 grit scratches after the 80 blocking has told me it's flat. I'll dig up a receipt with part #'s for klingspor roll paper in 600/800/1000 grits. I said I would dig them up last time it was brought up but I forgot. These are wet grits and work great on durablocks for color sanding.