Pro-Arte Lightly Polished Composite guitar strings offer long life and reduced finger noise, which makes them perfect for recording. 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. The Lightly Polished basses are silverplated copper wound on a multi-filament Composite core and then polished offering greatly reduced finger noise.