 Gibson Sag-Mb13 Masterbuilt Premium Phosphor Bronze Acoustic Guitar StringsGauges 13-17-26w-35-45-56. Masterbuilt Premium Phosphor Bronze Strings are top-quality acoustic guitar strings designed specifically for Gibson Montana’s flat top guitars. Masterbuilt strings help you pull the natural, expressive tone from your acoustic guitar. Each set is vacuum sealed for freshness and extended life.All Gibson strings are bench tested and builder approved to bring the best sound possible out of your instrument. Accessories, Strings, Guitar Strings, Acoustic Guitar Strings, 6 String Sets for Acoustic Guitar, .013 Gauge Acoustic Guitar Strings Gibson SAG-MB13 Gibson, .013 Gauge Acoustic Guitar Strings |