D'Addario was the first to use Phosphor Bronze in acoustic guitar strings back in 1974. Today, Phosphor Bronze is played throughout the world and considered to be the standard in acoustic strings, thanks to its beautiful sonic balance and tonal warmth. Our pioneering Phosphor Bronze acoustic guitar strings are precision wound with phosphor bronze wrap wire over a high-carbon steel core, providing tonal versatility suitable for all acoustic styles and musical genres. These 11-52 Custom Light gauge strings have slightly more volume and projection than Extra Light, while still being easy to play. Features: - •\tD'Addario's lightest gauge acoustic guitar string set, known for its superb, long-lasting tone and playing ease •\tPreferred for its warm, bright, and well balanced acoustic tone •\tEnvironmentally friendly, corrosion resistant packaging for strings that are always fresh •\tMade in the U.S.A. for the highest quality and performance •\tString Gauges: Plain Steel .011, .015, Phosphor Bronze Wound .022, .032, .042, .052