Silver plated copper wound on an exclusive Composite core material for powerful, long lasting tone / Composite 3rd/G for increased projection, clear nylon 1st and 2nd strings. All laser sorted for consistent, precise intonation / Extra-hard tension, optimal for maximum string resistance and projection without compromising tone / Made in the U.S.A. for the highest quality and performance / String Gauges: Trebles .0290, .0333, .0416 Basses .030, .036, .045 / Environmentally friendly, corrosion resistant packaging for strings that are always fresh