John Pearse® Acoustic 12 String Guitar Phosphor Bronze C# Tuning, .013 - .056, 1450Hstar rating 5Barry Big B BrennerAugust 14, 2009Love these JP strings for my Dell'Arte LEADBELLY 12-String Guitar; "Miss Stella Blue". I tune C-C and yes, they work tone wonders! http://www.bigbbrenner.com