Knucklehead Acoustic Guitar Strings - 12-string Precision-Spun Rare Phosphor Bronze Alloy Ultra-High Tensile Hexagon Cores Producing the most brilliant, warm, and balaned tones anywhere Includes Extra high-G String (E)9/9 (B)12/12 (G)20/8 (D)26/11 (A)36/20 (E)46/24