D'Addario Phosphor Bronze Acoustic Guitar strings are acclaimed worldwide for their superb, long-lasting tone. 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's most popular acoustic guitar strings. Diameter Tension Item# Note inches mm lbs kg PL012 E 0.012 0.3 23.3 10.57 PL012 E 0.012 0.30 23.3 10.57 PL016 B 0.016 0.41 23.3 10.57 PL016 B 0.016 0.41 23.3 10.57 PB025 G 0.025 0.64 32.8 14.88 PL010 G 0.010 0.25 22.9 10.39 PB032 D 0.032 0.81 30.5 13.83 PL014 D 0.014 0.36 25.2 11.43 PB042 A 0.042 1.07 29.9 13.56 PL020 A 0.020 0.51 28.9 13.11 PB052 E 0.052 1.32 25.2 11.43 PB030 E 0.030 0.76 34.1 15.46