Elixir Strings 80/20 Bronze 12-String Acoustic Guitar Strings w POLYWEB Coating, Light (.010-.047) 12-string acoustic guitar strings constructed with 80/20 (80% copper, 20% zinc) bronze wrap wire Played for a warm and robust tone that sounds played-in but still retains a remarkably clear mid-range presence Original POLYWEB Coating provides a soft, smooth feel that keeps the strings from getting in the way of playing Our patented coating technology protects against common corrosion, extending tone life longer than any other brands coated or uncoated strings (Elixir Strings player survey) 12-String Light gauge: .010/.010 .014/.014 .023/.009 .030/.012 .039/.018 .047/.027