3M Pro Grade Sanding Sponge 4.5 x 2.5 x 1-Inch - 4-Piece Set Professional Grade Block Sanding Sponge Anti-Load Coating For Longer Wear Life Sharp, Abrasive Mineral Cuts Fast Sands Flat & Countoured Surfaces - Wet & Dry Use Includes (2) Fine Grit Sponges And (2) Medium Grit Sponges