Looks like anodized aluminum, is it?They work great. But, if they are the same ones I bought a few years ago (and they appear to be), the bolt does rust, and the black on the extenders disappears and they become more of a gold color. I'll try to post a pic in a bit.
Link to pics: Snapfish: Share:Registration
Hadn't noticed before, they're actually two different shades of gold. They actually look kinda good, just not on my grey '09 so they'll be going back over to my blue '04, having purchased a newer pair from Richland Rick for the '09 that I expect will stay black.