D’Addario Medium, 12-52, 12 String Acoustic Guitar Strings Single Set EJ39

EJ39 is a medium top, heavy bottom Phosphor Bronze set ideal for increased volume and projection for acoustic 12 String guitars. Since D’Addario introduced Phosphor Bronze guitar strings in 1974, they have been synonymous with warm and well-balanced acoustic tone.
  
D’Addario 12-String Phosphor Bronze, Medium, 12-52, Acoustic Guitar Strings EJ39 Feature:

• Medium gauge 12-string set, ideal for heavy strumming and a resonant, projecting tone
• Preferred for its warm, bright, and well balanced acoustic tone
• Environmentally friendly, corrosion resistant packaging for strings that are always fresh
• Made in the U.S.A. for the highest quality and performance
• String Gauges: Plain Steel .012/.12, .016/.016, Phosphor Bronze Wound .025/.010(p), .032/.014(p), .042/.020(p), .052/.030(w)