D#39;Addario EJ-46 Pro-Arte Classical-3 Pack Pro-Arte strings are the world#39;s best selling and D#39;Addario#39;s premium classical guitar 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. Pro-Arte basses are wound using silver plated copper on a multi-filament nylon core for consistent, warm-yet-projecting tone. Diameter Tension Item# Note inches mm lbs kg J4601 E 0.0285 0.724 15.8 7.17 J4602 B 0.0327 0.831 12.0 5.44 J4603 G 0.0410 1.041 12.4 5.62 J4604 D 0.030 0.76 16.3 7.39 J4605 A 0.036 0.91 15.9 7.21 J4606 E 0.044 1.12 14.5 6.58