Use this WallSand A221 coarse grit paper cut sheet with your sanding block for demanding jobs with sanding drywall compound and patching plaster before you prime for painting. Its aluminum oxide grain and die-cut produces a shallow scratch pattern to help commercial and residential contractors and DIYers improve the surface finish on walls and ceilings. Sheet has a C-weight backing paper for easy flexibility on tough jobs, and a convenient bulk package to save you money and time on the site for moderate material removal jobs.