Heavy 12 string set for acoustic guitar from NANOWEB series with ultra-thin (5-micron) coating that protects the entire string, keeps gunk out of the gaps between the windings, and delivers extended tone life, bright, balanced sound and extra-long lifespan of the strings. Special coating also reduces unnecessary finger friction and squeak, therefore enhances the playability and provides consistent performance. Strings are made of plain steel core with 80/20 bronze winding (80% soft copper, 20% durable zinc), presenting a smoother, mellower and warmer tone. This set is great bridge between the feel of standard acoustic strings and tension of electric strings. Gauges: .013/.013, .017/.017, .030/.014, .039/.018, .047/.027, .056/.035.