Why? Could you not trade it against a aluminum version? There are people who would rather have one of these.
I believe it is made of chrome-plated aluminum. Underneath the chrome there is (usually) a thin layer of nickel, and underneath the nickel is a thin layer of copper.
The metal user for the original balance pipe was a chrome/nickel alloy, but it was not as shiny. Maybe a more accurate finish (more so than aluminum) could be obtained just by dulling the chrome somehow, but I am not sure.
Nickel can be darkened using "gun blue" liquid. Not sure about chrome, though.