Elixir 11150 Polyweb 12-String Lite Acoustic Strings are plain steel strings that have been anti-rust plated. These wound strings are wrapped with a Polyweb coating that is exclusive to Elixir. This coating gives the Elixir 11150 Polyweb strings a longer life, and allows for faster fret action while at the same time reducing the amount of string noise while you play.