INSTRUMENT STRING SET D'Addario string set for Irish Bouzouki from various scales. Smooth flat steel ropes and Phosphor Bronze rods. Gauges: 2x011 - 2x016 - 2x028 - 2x040. D'Addario's J81 strings have been exclusively designed for bouzoukiirlandes of various scales. The unwound wires are made of smooth steel and the wound wires of steel with a phosphor bronze outer shell. Known worldwide for their long-lasting tuning. Phosphor bronze was introduced to the string production line by D'Addario in 1974 and has become synonymous with tonal warmth.