Nada190 :
It's silver color on the top and copper on the inside. Wondering if it's actually silver or aluminum.
It's this: http

/www.amazon.com/Monster-XLN12S-18SB-Standard-Discontinued-Manufacturer/dp/B002MBZVFE
I'm sorry, I don't see a question here. What do you need to know?
Update: Sorry, I re-read it and I see the question. Many cables by any manufacturer are copper coated with a thin plating of tin to reduce corrosion. Silver is a better conductor that copper, which is better than tin. I could look up the actual numbers, but so could you.
Some of Monster's cables actually do use a silver plating, supposedly to increase the conductivity (reduce resistance). In practive, it usually does not make enough difference to justify the...