This is new silicon carbide sand paper that is great for sanding wood, car, metal, paint, MDF, varnish, and filler. It has a self-fastening hook and loop backing. The front sanding surface is gray and the back fastening surface is white. Fits most 5" (125mm) random orbital sanders. Phenomenal for dry sanding and also works great for wet sanding. Easy to use, simple, and low in cost. They are available in either 80, 120, 180, 240, 320, 400, 600, 800, 1000, 1500, 2000, or 3000 grit. Please view all photos of this silicon carbide sandpaper before buying :)