I think this is anodized aluminum. Profile is slightly taller than OEM so I don't use it anymore, as all of my keysets are Cherry profile. It will go well with OEM-profile keycap sets or perhaps even SA profile.
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(http://i.imgur.com/qtthKF7.jpg)
(http://i.imgur.com/DfJY0F2.jpg)
(http://i.imgur.com/mywOtWc.jpg)
$20 + shipping (couple dollars within the U.S.)