Length: 43 Inches 80/20 Bronze wound strings are often called ??old-school, vintage and/or bright bronze?? and were the most popular (only) alloy used to make acoustic strings until the introduction of phosphor in the early Seventy??s. 80/20 bronze wire is made from 80 percent copper and 20 percent zinc. 80/20 bronze provides a balanced highs and low with a slight increased in mid-range that seems the make the notes ??cut-through?? a little more. It tooko several years of trial and error to develope a proprietary string coating the resists tarnish and corrosion withour compromising out tonal quality.