80/20 Bronze is 80% Copper and 20% Zinc. 80/20 Bronze is often called Golden Bronze for its more golden color. Many players enjoy the enhanced mid range tones, the crisp highs and defined lows that 80/20 Bronze provides. Players who have guitars with a "darker" sound have said that 80/20 tends to "wake up" these kinds of guitars. Many players believe that Round Core strings seem to have less tension, easier to bend and a more wide open tone with a lot of chime. The installation of Round Core strings requires a special procedure. CLICK HERE to watch a video explaining how it is done.