Amazon.ca Product Description D'Addario was the first to use Phosphor Bronze in acoustic guitar strings back in the early '70s. Today, Phosphor Bronze is considered the pinnacle of acoustic string alloys, thanks to its beautiful sonic balance and tonal warmth, suitable for all musical genres. EARN REWARD POINTS with the code on the recyclable, resealable VCI bag, which you can register to earn Players Circle points. From the Manufacturer D'Addario's lightest gauge of acoustic strings, EJ15s are ideal for beginners or any player that prefers a softer tone and easy bending. Buy 3 sets and save!Phosphor Bronze was introduced to string making by D'Addario in 1974 and has become synonymous with warm, bright, and well balanced acoustic tone. D'Addario Phosphor Bronze strings are precision wound with corrosion resistant phosphor bronze onto a carefully drawn, hexagonally shaped, high carbon steel core. The result is long lasting, bright sounding tone with excellent intonation.D'Addario, the world's largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. D'Addario's innovative, packaging reduces waste and provides protection from corrosion. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.