CORROSIONRESISTANT PRECISION WOUND DAddario Phosphor Bronze acoustic guitar strings are precision wound with phosphor bronze wrap wire over a hexagonal highcarbon steel core WARM BALANCED TONE Phosphor Bronze wrap wire provides triedandtrue DAddario acoustic tone with beautiful balance and warmth suitable for all musical genres MOST POPULAR ACOUSTIC GUITAR STRING Now the standard in acoustic guitar strings Phosphor Bronze strings were originally pioneered by DAddario in the 1970s EARN REWARD POINTS DAddario Phosphor Bronze acoustic guitar strings come with a code on the recyclable VCI bag which you can register to earn Players Circle points MADE IN THE USA Our Phosphor Bronze strings are made in the USAdrawn to exacting specifications at our New York production facility