D'Addario's lightest gauge of acoustic strings, EJ15s are ideal for beginners or any player that prefers a softer tone and easy bending. D'Addario's lightest gauge acoustic guitar string set, known for its superb, long-lasting tone and playing ease Preferred for its warm, bright, and well balanced acoustic tone Environmentally friendly, corrosion resistant packaging for strings that are always fresh Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .010, .014, Phosphor Bronze Wound .023, .030, .039, .047