Developed under the direction of Gibson’s Master Luthiers, these strings are phosphor bronze wound to give your guitar a bright attack and sustained warmth, providing you with the ultimate acoustic sound. Suitable for any playing style, Gibson Phosphor Bronze strings are un-coated for an authentic acoustic feel, making these a favorite for the Gibson Team in Bozeman, Montana. Light Gauge: .012 .016 .024 .032 .042 .053