Improve your blending, cleaning, and surface prep results with the Merit A/O medium grit TR (Type III) non-woven quick-change buffing disc. Made from an aluminum-oxide grain and resin-bond blend, this durable disc facilitates smooth, consistent and smudge-free cuts. Because it features non-woven nylon fibers laminated to a durable-yet-flexible nylon backing, you can grind on harsh, jagged surfaces without worrying about ripping. Depend on this disc to remove modest rust, oxidation and coatings while leaving the original surface intact. Medium grit for blending and cleaning fiberglass and composites, super alloys, steels, aluminum, cast iron, ductile iron and grey iron. Package of 25.