Avora Industrial Resin Fiber Discs are manufactured with premium media. Avora premium material is superior because of its engineered particle size and scientifically formulated ingredients. Avora abrasive grains are consistent and uniform making them aggressive, responsive and long lasting. Avora Resin Fiber has very high wear resistance where purity and strength are critical. Engineered to resists break down at the microcrystalline level when operating at high temperature and great stress. Avora Resin Fiber Discs are bonded with proprietary resin to a poly / cotton backing. The combination of resin bond and poly / cotton fabric means maximum efficiency, greater edge strength and life endurance because of its low stretch, high strength properties combined with its high concentrations of Premium Media. Avora products are manufactured on state of the art computer-controlled machines that are subject to numerous performance and safety tests to ensure the highest quality and greatest safety.