75/25 Bronze acoustic guitar strings are precision wound over a hexagonal high carbon steel core. Played for a dynamic balance of rich, full-bodied tone and sparkling high-end clarity.Three Gauges, Extra Light:(010, 014, 023, 030, 039, 047); Super Light: (011, 015, 024, 032, 042, 052) ,Light: (012, 016, 024, 032, 042, 053)