Ernie Ball Earthwood Phosphor Bronze acoustic guitar strings are produced with an exclusive phosphor bronze wrap wire. Engineered to meet the demands of acoustic musicians worldwide these concert quality strings provide deep rich bass notes with clear bright trebles. Made with the finest and freshest raw materials all Ernie Ball strings are hermetically sealed to ensure your strings stay as fresh as the day they were made. Ernie Ball Item No. 2144 PO2144 Gauges .013 .017 .026 .034 .046 .056 Get yours today; with the security of our many decades of experience and Sam Ash Direct efficient order processing your satisfaction is guaranteed!