Heleta's Fiber Discs are designed to handle any sanding or finishing job performed with a right angle grinder. The disc's sandpaper face is constructed of industrial-grade backing paper for tear resistance, and premium aluminum oxide or zirconia grain for aggressive stock removal. It's also reinforced with industrial grit and glue for increased life and durability. Our disc's superior friability allows the wheel to breakdown and consistently expose new grain for a longer life. The sandpaper is specially coated to prevent clogging and increase removal rate.