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 51150 5" Dia. Disc Backup Pad, Medium Density, 5/8"-11 Thread
Dynabrade 56178 6" Dia. Vacuum Disc Pad, Vinyl-Face
Dynabrade 91565 6" Dynacut Extreme Orange Premium Film Disc, 120 Grit, Hook & Loop, Vacuum Holes, 50/Box
Dynabrade 97319 Wave Spring Washer 
