Flex I File 1001 Sanding & Finishing Foam Blocks Asst 4 pk Contents: 1 Block of Each Alphas Super Sanding & Finishing Foam Blocks are made with a cushioned foam center and are coated with two complementary grits, according to each colour. The inner foam core provides a cushion for you sanding comfort on long sanding project. The size of the surface area also allows you to cover more ground in a shorter period of time. This product can be used to sand, scratch, distress, or smooth wood, plastic, or metal projects.