flap disc material is aluminium and Zirconium and Silicon carbide,backing ... and plastic or metal Product name: Flap DiscApplications by different abrasive:1)Aluminium Oxide,symbol: ASuitable for iron, mid steel ... aluminium,non-ferrous metals and wood.2)Silicon Carbide (disc in black color),symbol:CSuitable for marble,stone,building ... Box with or pallets or as per other requirement. abrasive flap disc