The desired length of the strip can be torn from the roll for a specific application. Most grades have a light, J-weight cloth backing that provides the flexibility needed to conform to circular edges, angles, or other contours. Rolls in grades P50 or P60 have a slightly stiffer X-weight backing suitable for more coarse sanding applications. Cloth remains durable even when bent or rolled, without tearing or shelling, but strips can be torn by hand when a smaller piece is needed, without compromising the sanding surface.
Aluminum oxide is a popular choice among industrial professionals because of its fast cut-rate and long life. This mineral makes a tough, durable abrasive that self-fractures to expose fresh cutting edges, whereas traditional natural abrasives dull more quickly. Aluminum oxide is suitable for a wide variety of materials in both woodworking and metalworking, including ferrous alloys. Aluminum oxide abrasive can be used on ferrous and non-ferrous metals, wood, and plastic.

Dynabrade 10690 Filter/Regulator/Lubricator, FRL40, 1/2" NPTAssy.
Norton 66261126299 - 2" X 50 Yard 80 Grit Metalite™ Aluminum Oxide Cloth Roll, 1 Each
3M 02405, Utility Cloth Sheet 211K, 9 in x 11 in 220 J-weight, 7010299775
3M 08857 Scotch-Brite Surface Conditioning Belt, SC-BS, A/O Medium, 1/2 in x 18 in, 7000028454, 48011088570
Standard Abrasives 707195, Aluminum Oxide Handy Roll, P80 J-weight, 2 in x 50 yd, 7100031626
3M 03999 Scotch-Brite Surface Conditioning Belt, SC-BS, A/O Medium, 2 in x 132 in, 7010309300
3M 17528 Scotch-Brite Surface Conditioning Low Stretch Belt, SC-BL, A/O Very Fine, 1-1/2 in x 60 in, 7010292405
3M 19768, Utility Cloth Sheet 314D, 9 in x 11 in P180 J-weight, 7000000356
3M 11412, Roloc Disc 361F, 36 YF-weight, TR, 1 in, Die R100N, 7000045092
3M 86745, Diamond Disc, 2" Roloc, 674W, 120 Mesh, TR, 7100022116, Box of 10
Dynabrade 11476 Dynabelter Abrasive Belt Tool, Heavy-Duty
3M 19795, Utility Cloth Roll 314D, P400 J-weight, 1-1/2 in x 20 yd, 7100081717 
