Here you can find Pearl Abrasive's Premium Aluminum Oxide Resin Fiber Disc.  This abrasive disc is excellent at sanding, blending and finishing work.  It can also be used for rust removal, surface preparation, polishing, burr removal, blending and finishing work. 

The Premium Aluminum Oxide resin fiber disc is made for use on Ferrous Metals including Steel, Iron, and Sheet Metals.