What is this wire made of?

So I purchased this late night for I wanted oxygen free solid copper. Amazing price for 250 feet right? Well while this company promotes its "oxygen Free",...there is nothing to say what the "polarized conducting" material is in any of the advertising. How/why would they leave that out?!?!? So either the advertising dept of the firm is completely incompetent to forget to say this is copper wire. OR the advertising in trying as hard as they can to SOUND LIKE copper speaker wire. Which would be a total con in my books. I will use this "Oxygen Free Polarized Conductors" speaker wire for speakers in my garage and marvel at the great deal I got. Buyer beware of "Oxygen Free " advertising.

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