Use these D'Addario Nickel Bronze acoustic guitar strings during live performances, studio recordings, or just casual home playing. They're great for both beginner and professional guitarists who want a better sound from their acoustic guitars. The strings come in gauges: Plain Steel.012,.016, Nickel Bronze Wound.024,.032,.042,.053. They're made in the USA, and the environmentally - friendly, corrosion - resistant packaging keeps them fresh.