EJ38, D'Addario's most popular 12-string set, offers the ideal balance of volume, projection and comfortable playability. Designed for all makes and models of 12-string acoustic guitars. 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 long lasting, bright sounding tone with excellent intonation.