Referred to as Custom Light EJ26 strings are a D Addario original hybrid gauge and a comfortable compromise for players who want the depth and projection of light gauge bottom strings but slightly less tension on the high strings for easy bending. Buy 3 sets and save (3D). 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.