Elixir® Strings Acoustic Phosphor Bronze With NANOWEB Coating deliver distinctive phosphor bronze warmth and sparkle together With extended tone life. #1 acoustic guitar string* Only coated string brand to protect the entire string With an ultra-thin coating, keeping gunk out of the gaps between the windings Extended Tone Life – players report their tone lasts Longer than any other string, uncoated or coated Consistent performance and tone – ready to play whenever you are Smooth feel that is easy on your fingers and enhances playability Reduces finger squeak – good for both performance and recording Anti-Rust Plated Plain Steel Strings resist tone-deadening corrosion, ensuring a Longer life for entire set With less hassle and expense of frequent string changes, spend more time making music