Medium 6 string set for acoustic guitar from Earthwood 80/20 Bronze Acoustic series that provides crisp, bright sound with lots of clarity and pleasing overtones. Strings are made from 80% copper-20% zinc wire wrapped around hex-shaped tin-plated steel core wire. Strings are precisely manufactured to the highest standards and most exacting specifications to ensure consistency, long life and optimum performance. Gauges: .013, .017, .026, .034, .046, .056.