| 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! Exclusive multifilament core material | 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 |