Medium 6-string set for acoustic guitar from Masterbuilt Premium series that was specifically designed for Gibson Montana’s flat top guitars and delivers natural, expressive tone. Strings are made with the highest quality Swedish steel “hex” cores with fine slow-wrapped 80/20 bronze winding – they provide maximum strength and stability, and deliver a full, warm sound. This set is packed in vacuum sealed package for extra freshness. All Gibson strings are bench tested and builder approved to bring the best sound possible. Gauges: .013, .017, .026w, .035w, .045w, .056w.