With seededgel, Pgraded ceramic alumina abrasive and a lasercut vacuum hole system that extracts dust to keep your work area clean and protect against contamination, this ProSand multiair cyclonic A975 medium grit paper hook and loop center hole vacuum disc is ideal for sanding and finishing aluminum, fiberglass, wood and composites The hookandloop back makes it easy to mount and change discs, while tear strength and flexibility are provided by the latexsaturated, fiberreinforced Cweight backing An open coat and waterbased, nonpigmented stearate offer maximum load resistance without transferring colors to your workpiece This disc offers the longest life of any paper disc