Best in Class. Fast stock removal with exceptional long life.Premium Ceramic Grain, premium stearated coating prevents loading.?âòÂì?ÓC?âòÂì?Ý medium-weight, low flexibility paper backing.Available with Hook & Loop Backing or PSA Backing., Strong resin over resin bond construction is resistant to heat and moisture.This special sharp and durable grain cuts fast and lasts long.Hook & Loop Fastening System: Allows for quick changes and less downtime. Available with or without vacuum holes for use on random orbital or low speed DA sanders with capture systems.PSA Disc Rolls: Perforated for easy disc tear away from roll. Packaged 4 rolls per box.Individual PSA Discs: Tabbed for easy removal of release paper.Backing Pads, Interface Pads and Contour Hand Pads for Paper Discs are available in Accessories.