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.
First set of coated strings, but love these diameters and a plain third. This is my third set of CM's and I no longer have any interest in other brands. I've played 'em all. Bright and Bendy.