EJ84L loop end gypsy jazz acoustic guitar strings are designed and gauged for rhythm and strumming patterns associated with "Django", jazz-style guitar. D"Addario Gypsy Jazz strings are specially designed for the "Django" style. Silver-plated Copper is wound on a high carbon steel core, delivering a warm, projecting tone optimal for any Gypsy Jazz style guitar.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. 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.