3M Green Corps Sanding Disc, 31550, 8 in, 40 grit Five sheets of 40 grit sandpaper designed to be used with the 3M Stickit back up disc pad These coarse 8" inch papers can be used stripping paint to metal, featheredging around the repair area, as well as shaping and sanding body filler. Use during Stage 1 of the 3M Body Repair System. The abrasive is a long-lasting tough mineral, resists loading. The adhesive backed sandpaper disc (Stickit) makes sanding easy and convenient, just press the disc on the pad (PN 05579, 5568) and sand.