Medium 6 string set for acoustic guitar that utilizes Gibson’s heralded production standards to achieve the proprietary mix of phosphorus and bronze. These strings are also used on Gibson Acoustic’s J-200 models. Strings are made with a slow-winding process that results in richer tones and a longer lifetime. Their ends are silk-wrapped to reduce saddle wear and eliminate sympathetic overtones. Strings utilize strict quality control methods to ensure tone, durability and consistency. All Gibson strings feature specs absolutely unique to Gibson and are factory sealed to guarantee freshness in every set. Gauges: .013, .017, .026, .035, .045, .056.