Feature polished basses for reduced finger noise - ideal for recording / Laser sorted black nylon treble strings for consistent, precise intonation / Hard tension, a popular choice for its rich tone, increased resistance and strong projection / Made in the U.S.A. for the highest quality and performance / String Gauges: Trebles .0285, .0327, .0410 Basses .030, .036, .044 / Environmentally friendly, corrosion resistant packaging for strings that are always fresh