The D'Addario EJ38 12-String Phosphor Bronze Light Acoustic Guitar Strings are built on a high-carbon hexagonal steel core with an 80/20 phosphor bronze plating for the utmost in durability and tone.
String Gauges: Plain Steel .010/.10, .014/.014, Phosphor Bronze Wound .023/.008(p), .030/.012(p), .039/.018(p), .047/.027(w)