Descriptions:1.Aluminum oxide resin discs are with a strong resin-on-resin bond that assures reliable performance.2.Strong fiber backing that provides superior grinding performance and extended useful life.3.Aluminum oxide fiber discs are made with a fiber backing that adds rigidity and versatility. 4.Can be used in a variety of ways, from grinding, de-burrsing, and stripping, to blending, cleaning, finishing, and polishing.