12-16-24W-32-44-54 43 inches. 80/20 Bronze wound strings are often called old-school, vintage and/or bright bronze and were the most popular alloy used to make acoustic strings until the introduction of phosphor in the early Seventies. 80/20 bronze wire is made from 80 percent copper and 20 percent zinc. 80/20 Bronze provides balanced highs and lows with a slight increase in mid-range that seems the make the notes "cut-through" a little more. It took several years of trial and error to develop a proprietary string coating the resists tarnish and corrosion without compromising tonal quality.