With P-graded ceramic alumina abrasive and a laser-cut vacuum hole system that extracts dust to keep your work area clean and protect against contamination, this ProSand Multi-Air Cyclonic A975 medium grit paper disc is ideal for sanding and finishing aluminum, fiberglass, wood, and composites. The hook and loop back make it easy to mount and change discs, while tear strength and flexibility are provided by the latex-saturated, fiber-reinforced C-weight backing.