Great for working with all metals, including platinum, sponge sanding pads from 3M are flexible enough to conform to almost any contour or surface. Micron-graded abrasives make them safe for every stage of sanding and pre-polishing. Use pads wet or dry for a wide variety of metal, model-making and lapidary applications. These high-quality pads are made of long-lasting, closed-cell foam rubber and permanently bonded with aluminum oxide abrasives. They won’t gouge surfaces and the convenient, hand-sized pad can be folded or trimmed to fit into detailed areas. Super-fine grade.