AUTOMOTIVE CRANKSHAFT MICRO POLISHING SANDING BELTS.  MADE OF PREMIUM ALUMINUM OXIDE MATERIAL ON A VERY FLEXIBLE "MYLAR" MICRON FILM BACKING.  FINE FINISHING IS WHAT THIS BELT EXCELS AT.  ADDED FELT CUSHION ON BACK SIDE ADDS FOR PRECISE AND CONSISTENT FINISHES.  STANDARD STRAIGHT EDGE.  THEY WILL POLISH BETTER THAN STANDARD BELTS AND GIVE A GREAT FINAL FINISH.