Elixir Strings 80/20 Bronze Acoustic Guitar Strings w NANOWEB Coating, HD Light (.013-.053) Acoustic guitar strings constructed with 80/20 (80% copper, 20% zinc) bronze wrap wire Played for a crisp, bright tone with an expressive, vibrant presence Ultra-thin NANOWEB Coating provides a more traditionally textured, uncoated feel Our patented coating technology protects against common corrosion, extending tone life longer than any other brands coated or uncoated strings (Elixir Strings player survey) HD Light gauge: .013 .017 .025 .032 .042 .053 (specially developed with Taylor Guitars for a bolder high end and fuller low end)