EJ42 6 String phosphor bronze Resophonic guitar strings offer a warm, well balanced acoustic tone, optimal resistance and comfortable feel. The standard in Resophonic strings! 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.