What are the trim rings for A Body Rallye Wheels made of

Those are stainless steel, depending upon how bad the rash is, it can be sanded out. Get some 3M wet/dry paper, starting at 320 to 400 grit, take your time taking the marks down. Use increasingly finer paper as you go, until you are satisfied with the results. Use a buffing compound to take out the finest scratches and you should be through.