5 DIFFERENT SPONGE SANDING BLOCKS:Include coarse (grade 60 to 80), medium (grade100), fine (grade 120) and superfine (grade 240),From coarse to fine to meet your polishing requirements QUALITY MATERIAL:The foam sanding sponge made from high-quality brown corundum and high density sponges as bases - Good flexibility and not easy to tear,long service life WET AND DRY AVAILABLE:The foam sanding blocks Can be used directly in water.Because of its own water storage function, it can reduce flushing and improve work efficiency PORTABLE SIZE:5 Pieces /Package,Sanding sponge Size:4 x 2.8 x 1 inch,Suitable for grinding flat and irregular surface, wet or dry, portable and handy Multiple function:Widely used in the polishing of drywall,wood,plastic, paint,stone,metal materials of various complex surface,Also a good tool for cleaning in the kitchen