Phosphor bronze was introduced to string making by D'Addario in 1974 and has become synonymous with warm, bright, and well-balanced acoustic tone. D'Addario phosphor bronze strings are precision wound with corrosion-resistant phosphor bronze onto a carefully drawn, hexagonally shaped, high carbon steel core. The result is a long-lasting, bright sounding tone with excellent intonation. D'Addario offers a full range of acoustic guitar singles for all your replacement or customization needs. This .027 gauge phosphor bronze wound acoustic guitar string is preferred for its warm, bright, and well-balanced acoustic tone. It is perfect as a replacement string or for creating customized sets. Made in the U.S.A. for the highest quality and performance.