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Pro-Arte Composite silverplated copper classical guitar strings provide longer life than traditional Pro-Arte strings. All Pro-Arte treble strings are sorted by a sophisticated computer-controlled laser machine which performs diameter/tension measurements and quality checks, insuring true sounding, precise trebles in every set. Composite sets feature an additional Composite 3rd string, which provides tonal options and nicely balances nylon and wound strings. EJ45C, normal tension, is D'Addario's best selling "composite" set, preferred for its balance of bold, yet warm tone, comfortable feel and dynamic projection. Pro-Arte composite strings feature an exclusive multifilament stranded core material which delivers a powerful, but warm tone which lasts 2-3 times longer than traditional classical strings. 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. D'Addario, the world's largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. D'Addario's innovative packaging reduces waste and provides protection from corrosion. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.