85/15 Bronze combines the brilliance of 80/20 bronze with the durable properties of phosphor bronze. The 85/15 bronze wrap wire is precisely wound onto a carefully drawn, hexagonally shaped high-carbon steel core, resulting in a long-lasting, bright sound with excellent intonation. D'Addario, the world's largest manufacturer of musical instrument strings, known as The Players Choice, has a reputation for unmatched quality and consistency. D'Addario's innovative, eco-friendly packaging reduces waste and provides protection against corrosion. All D'Addario strings are made in the USA using proprietary, state-of-the-art digitally controlled machines for unparalleled performance, set by gauge. Gauge: 013, 017, 026, 035, 045, 056.