Phosphor Bronze acoustic bass strings give you the sweet tone and easy feel you want when playing unplugged. With their beautiful sonic balance and tonal warmth, D’Addario Phosphor Bronze have become the standard in acoustic bass strings. Precision wound with phosphor bronze wrap wire over a high carbon steel core, our Phosphor Bronze acoustic bass strings provide unparalleled versatility suitable for most acoustic styles.This 45-100 Regular Light Long Scale set fits most standard sized acoustic basses.