Material: silicon carbide Abrasives: aluminium oxide, silicon carbide Backing: vulcanized fibre paper Application: removing rust from metal and nonmetal surface, grinding welding seams, polishing, removing burr, etc. It is widely used in auto, aviation, machinery, instrument, bridge, construction, etcAvailable size: 4"×5/8", 4.5"×7/8", 5"×7/8", 6"×7/8", 7"×7/8" semi flexible fibre disc