Airo-Sand Sanding Discs 40 - 150 Grit 10-Pack Multiple Grades - NumaticAiro Sand Sanding Discs For Woodworker Sanding Machine These pads are coated with an abrasive material to facilitate the sanding and smoothing of flooring. We carry various grades of these which can be selected above. There are six grades available which are as follows; 40 Grit 606131 Course 60 Grit 606132 80 Grit 606134 100 Grit 606135 120 Grit 606136 150 Grit 606137