Elixir Acoustic 80/20 Bronze Strings with POLYWEB Coating deliver a warm, "played-in" tone together with extended tone life that players have come to expect from Elixir Strings. the #1 selling 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