Silver plated copper wound on an exclusive Composite core material for powerful, long lasting tone / Wound strings are polished to a smooth surface for reduced finger noise, great for recording! / Composite 3rd/G for increased projection, clear nylon 1st and 2nd strings. All laser sorted for consistent, precise intonation / Made in the U.S.A. for the highest quality and performance / String Gauges: Trebles .0280, .0322, .036 Basses .027, .34, .043 / Environmentally friendly, corrosion resistant packaging for strings that are always fresh