D'Addario EJ45LP Normal Tension, Lightly Polished Nylon Classical Guitar Strings D'Addario Strings EJ45LP, normal tension, is D'Addario's best selling "lightly polished" set, preferred for its balance of rich tone and smooth feel. Pro-Arte lightly polished composite strings feature an exclusive multifilament core material which delivers a powerful, but warm tone which lasts 2-3 times longer than traditional classical strings. Each wound string is polished to a smooth surface for reduced finger noise. In addition to three traditional nylon treble strings, each set contains an optional monofilament composite 3rd/G string, which provides greater projection and optimal balance between basses and trebles. All Pro-Arte treble strings are sorted by a sophisticated computer-controlled laser machine which performs diameter/tension measurements and quality checks, ensuring true sounding, precise trebles in every set. Pro-Arte lightly polished sets are also ideal for recording.