Premium abrasive sanding sponges are flexible foam pads coated with aluminum oxide mineral. These single sided sanding Pads enable user to sand hard-to-reach areas inaccessible to machine sanders. The exceptional method used in the manufacturing process and the use of "solvent free" adhesives, reduces heat buildup at the point of contact and extends the life of the foam abrasives. The soft flexible foam backing conforms too virtually to any contour, profile shape. These pads can be used wet or dry. Sponges are great for many applications can be used for sanding Auto Body Work on various Metals, Woodworking and Furniture, Plastics and Fiberglass… SPEFICICATIONS: JETS Product # 0120-7905 - Brand: STARKE Sanding Sponges - Abrasive Mineral: Coated with Aluminum Oxide Surface - Assortment Pack: 4 Grades SF / VF / F /M - Measures: 4-1/2" x 5-1/2" x 4-1/4" - Thickness: 3/16" - Pack Of 4 Pads - Made In Germany