Our GHS Phosphor Bronze acoustic guitar strings feature a special, durable alloy of copper, tin and phosphor wind over a hex core. This combination delivers a long-lasting, rich, and bright tone. Along with a redesigned core-to-cover ratio, this set gives increased brightness and flexibility without all those harsh overtones. We’ve perfected the core-to-cover ratio for increased brightness and flexibility, while doing away with harsh overtones. The cover wrap gives you a high end shimmer that will last for a long time. Introducing our brand new Nitro Pack singles! Each single string is sealed in a nitrogen environment, eliminating all oxygen, in a tear-resistant package. Whether you use one string or the whole set, the Nitro Pack guarantees straight from the factory freshness! ABOUT GHS STRINGS GHS Strings are manufactured in a state-of-the-art, climate controlled facility using precision equipment and only the purest of materials. The air-tight Fresh Pack locks in factory freshness that endures the test of time and locks out corrosion. When you buy GHS strings you get quality, consistency, lasting intonation and superbly harmonious sound! GHS Strings - The String Specialists since 1964.