Elixir Strings Phosphor Bronze Acoustic Guitar Strings w NANOWEB Coating, HD Light (.013-.053) Acoustic guitar strings constructed with phosphor bronze wrap wire Played for a dynamic balance of rich, full-bodied tone and sparkling high-end clarity Ultra-thin NANOWEB Coating provides a 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)