Phosphor bronze was introduced into string production by D'Addario in 1974 and has since become synonymous with a warm, bright, and balanced acoustic sound. D'Addario's phosphor bronze strings are precisely wound with corrosion-resistant phosphor bronze around a carefully drawn, hexagonally shaped high-carbon steel core. The result is a durable, bright-sounding tone with excellent intonation. D'Addario offers a complete range of individual strings for acoustic guitars to meet all your replacement or customization needs. This .034 gauge phosphor bronze string is favored for its warm, bright, and balanced acoustic tone. It is perfect as a replacement string or for creating custom string sets. Made in the USA for the highest quality and performance.