Use these D'Addario Nickel Bronze strings when you're playing your acoustic guitar at home, on stage, or in a studio. They're perfect for both beginner and professional guitar players who want to enhance their guitar's sound. The string gauges are Plain Steel .012, .016, and Nickel Bronze Wound .024, .032, .042, .053. These strings are made in the USA, ensuring high - quality performance and come in environmentally - friendly, corrosion - resistant packaging to keep them fresh.