- Pro-Arte nylon string set for classical guitar - Comfortable balance of volume and resistance - Warm, full, and consistent tone - Laser-selected trebles for pure intonation and tonality - Nylon core basses for perfect warmth and projection - String gauges: Trebles .0280, .0322, .0403 Basses .029, .035, .043 - Made in the USA with computer-controlled winding technology - Strings sealed inside and out - Product description: EJ45 normal tension is D'Addario's best-selling classical guitar set, chosen for its balance of robust tone, comfortable feel, and dynamic projection. Pro-Arte classical guitar strings make up D'Addario's premium quality classical guitar string sets. All Pro-Arte treble strings are sorted by a sophisticated computer-controlled laser machine