Elixir 16052 Phosphor Bronze with Ultra-Thin Nano Coating Acoustic Guitar strings deliver a distinctive phosphor bronze warmth and sparkle together with extended tone life. Players report their tone lasts longer than any other string, uncoated or coated and that they provide consistent performance and tone with a smooth feel that is easy on your fingers and enhances playability. The nano-coating reduces finger squeak good for both performance and recording. The plain steel strings are anti-rust plated to offer resistance against tone-deadening corrosion. With less hassle and the expense of frequent string changes, spend more time making music.