D'Addario's most popular acoustic guitar string set. Available in a convenient bulk pack of 25 sets / Preferred for its warm, bright, and well balanced acoustic tone / Bulk shop packaging is ideal for workbenches or anywhere bulk packaged strings are needed / Made in the U.S.A. for the highest quality and performance / String Gauges: Plain Steel .012, .016, Phosphor Bronze Wound .024, .032, .042, .053 /