Our 3M™ Cubitron™ II Stikit™ film disc 775L features 3M™ precision shaped ceramic grain, a revolutionary advancement in abrasive technology. The triangular shaped ceramic mineral is designed to slice through the substrate, rather than gouging or \"plowing\" like conventional abrasives, resulting in a disc that cuts up to 2X as fast and lasts up to 6X as long as conventional abrasives. These discs are ideal for a broad range of applications focused primarily on stock removal and are effective on a wide variety of substrates, including metals, composites, gelcoat and whitewood. The film backing offers greater tear-resistance than paper discs, for additional durability and edge retention. For best results, pair with 3M™ elite random orbital sanders. Our 3M™ Stikit™ system eliminates the time consuming task of applying adhesive to the disc backing. These high quality, coated abrasive products come ready-to-use with a pressure sensitive adhesive coating on the backside so that attaching them to your disc pad is as simple as pressing on a sticker. And because the adhesive is pressure sensitive, the disc can be peeled off of the disc pad just as easily, leaving a clean surface for your next disc. A Stikit™ disc must be pressed onto a Stikit™ backup pad (also called a disc pad and sold separately) that is attached to a disc sander, random orbital sander or stationary disc sander. Cubitron™ II 7100075217, Open Coated PSA, 5 in Diameter Disc, 220 Grit, Very Fine Grade, Ceramic Alumina Abrasive, Film Backing, 3 mil Backing Weight, 5 Vacuum Holes