These pads are the proper denseness for use with our Metal Polish. When polishing metal, a by-product is a dark, black film. It often contaminates pads and cloths making them non-reusable. With these pads however, simply rinse them with warm water and the black mess is gone. Reuse over and over again. Use with our 3" Random Orbital or by hand with the 3" Foam Pad Holder. Both attach via the pads hook and loop and make any job a lot easier.