Our 3M™ Cubitron™ II Stikit™ paper disc roll 732U 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 4X 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 C-weight paper backing is well suited for sanding applications where edge retention is not a primary requirement. For best results, pair with 3M™ elite random orbital sanders. The 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 7100067209, Open Coated PSA, 5 in Diameter Disc, 180 Grit, Very Fine Grade, Ceramic Alumina Abrasive, Paper Backing, C-Weight Backing Weight