All strings are loop-end.80/20 Bronze produces a bright tone with excellent clarity and projection.Gauges.009,.011,.013,.020w,.009.Ernie Ball Earthwood 5-String Banjo Bluegrass Loop End 80/20 Bronze strings are made from 80 percent copper, 20 percent zinc wire wrapped around hex shaped tin plated steel core wire. The most popular acoustic guitar strings provide a crisp, ringing sound with pleasing overtones. Gauges.009,.011,.013,.020w,.009