Check the listing for details. D'Addario EJ44 Pro-Arte Extra Hard Tension Silver Classical Guitar Strings Nylon. Condition: New. Listed at 11.99 USD. EJ44, extra hard tension, is optimal for maximum string resistance and projection without compromising tone. 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. Extra hard tension for maximum volume and resistanceLaser sorted clear nylon treble strings for consistent, precise intonationPrecision wound silver-plated basses for warm, projecting tone and the utmost consistencyMade in the U.S.A. for the highest quality and performanceString Gauges: Trebles .0290, .0333, .0416 Basses .030, .036, .045Environmentally friendly, corrosion resistant packaging for strings that are always fresh