The D'Addario EJ38 Phosphor Bronze 12-String Acoustic Guitar Strings (Light, 10–47) are designed to deliver a bright, balanced tone with excellent projection, making them ideal for a wide range of musical genres. Introduced by D'Addario in 1974, phosphor bronze has become synonymous with warm, well-balanced acoustic tone. These strings are precision wound with corrosion-resistant phosphor bronze onto a carefully drawn, hexagonally shaped, high-carbon steel core, resulting in long-lasting, bright-sounding tone with excellent intonation.