It is Aluminum. The DTM tips kick up quite a bit of carbon (Black stuff). I was trying that out to keep it off the paint. The adhesive began to release because of the heat so I have now removed them.
If only they were larger... we could use them as desktop wallpaper...
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1989 750iL sadly ignored, but still runs great
2000 M5 117,000 miles
2001 Tundra Hauls Stuff
2008 Z4 M Coupe On the cover of Oct. '08 Roundel
2008 Mercedes C350 Sport wifey's car
2009 BMW R1200GS-Adv for on & off-road