Check the listing for details. D'Addario EJ49 Pro-Arté Black Nylon Normal Tension Classical Guitar Strings. Condition: New. Listed at 11.95 USD. EJ 49Pro-Arté Classical Black Nylon Normal Tension EJ49, normal tension, is D'Addario's best selling classical set containing black nylon trebles, preferred for its balance of rich tone, comfortable feel and dynamic projection. 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.D'Addario's best selling Pro-Arté set, Normal tension offers balance of volume and comfortable resistanceLaser sorted black nylon treble strings for consistent, precise intonationPrecision wound basses for warm, projecting tone and the utmost consistencyMade in the U.S.A. for the highest quality and performanceString Gauges: Trebles .0280, .0322, .0403 Basses .029, .35, .043Environmentally friendly, corrosion resistant packaging for strings that are always fresh