Elixir Strings 16546 Acoustic Phosphor Bronze Guitar Strings with NANOWEB Coating, 3 Pack, Medium (.013-.056) 3 sets for the price of 2!! Medium Gauge: 013 017 026 035 045 056 Elixir Strings retain their tone longer than any other string, uncoated or coated. *Elixir Strings player survey Phosphor Bronze with NANOWEB coating Anti-Rust Plated Plain Steel Strings also resists tone-deadening corrosion, ensuring longer life for the entire set