ChromaCast CC-GS-CB-ML Classic Bronze Medium-Light Acoustic Guitar Strings, .012-.054 Long lasting, Classic Bronze strings These strings give you great response, clarity, bright trebles and deep, rich bass tones Made of 85% Copper and 15% Zinc Sealed, corrosion resistant packaging prolongs string life. Made in the U.S.A. Medium-Light gauge: .012, .016, .025, .032, .042, .054