These D'Addario EJ46 Pro-Arte Hard Tension Silver Strings come in a pack of 3.EJ46, hard tension, is a popular choice for its rich tone, increased resistance and strong 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.Hard tension for increased resistance, volume and projectionLaser sorted clear 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 .0285, .0327, .0410 Basses .030, .036, .044Environmentally friendly, corrosion resistant packaging for strings that are always fresh