EJ43 is the lightest tension available of D'Addario's best selling Pro-Arté series. Pro-Arte are D'Addario's premium classical guitar string sets and are the world’s most popular classical guitar strings.

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.