Gauges 29-33.3-38-30-36-47. EJ44C Pro-Arte Composites Classical Guitar strings are part of D"Addario"s premium classical guitar string series. Treble strings are measured by a sophisticated computer-controlled laser which performs consistency and quality checks, insuring true-sounding strings in every set. Basses are made with 80/20 bronze wound on nylon. D"Addario is the world"s largest manufacturer of strings for musical instruments. Many top guitarists won"t play any other brand. Regardless of your playing style, D"Addario has a set of strings that"s right for your classical guitar.