Pro-Arte, the world's most popular classical strings are D'Addario's
premium classical guitar string sets. All Pro-Arte treble strings are
sorted by a sophisticated computer-controlled laser machine which
performs diameter and tension measurements, ensuring true-sounding,
precise trebles in every set. Pro-Arte basses are wound using
silver-plated copper on a multi-filament nylon core for consistent and
warm, yet projecting tone.