EJ83M ball end gypsy jazz acoustic guitar strings are designed and gauged for rhythm and strumming patterns associated with "Django" jazz-style guitars. Silver-plated Copper is wound on a high carbon steel core, delivering a warm, projecting tone optimal for any Gypsy Jazz style guitar. String Gauges: Plain Steel .011, .015, Silver-plated Copper Wound .024, .029, .035, .045