Similar to Heleta's Fiber Discs, turbo Fiber Discs are designed for aggressive grinding with a right angle grinder. The disc is constructed of industrial-grade backing paper for tear resistance, and premium aluminum oxide grain for very aggressive stock removal. It's also reinforced with industrial grit and resin for increased life and durability. This combination of resin and grit allows turbo Fiber Discs to remove tremendous amounts of material in a short amount of time, while remaining highly durable and long lasting.