Ernie Ball Earthwood Light Phosphor Bronze Acoustic String Set, .011 - .052 Rich Expressive Sound Excellent Clarity Made in California, U.S.A. Featuring the finest and freshest materials. Made from 92% copper, 7.7% tin, 0.3% phosphorus wire Element Shield Packaging Prolongs string life and keeps strings as fresh as the day they were made Previously packaged as Super Slinky Acoustic Packaging may vary from pictured