3M™ Sanding Sponge 3M offers a broad selection of sanding sponges with different features and densities for both flat and contoured surfaces. Ideal for corners, contours, sealer and flat surfaces on wood, metal, plastic and paint. Superfine ranges from grade 500 to 600. Flexible foam pad enables user to sand hard-to-reach areas such as headlight openings, around door handles, door jambs, etc. Helps to eliminate finger marks and can be used wet or dry. 3M™ Softback Sanding Sponges are coated with aluminum oxide mineral. Each grade uses a range of mineral sizes. Superfine ranges from grade 500 to 600. Size Description: 5 1/2" x 4 1/2" x 3/16"