D'Addario's most popular choice for heavy strumming, flat-picking and resonant, projecting tone 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 .013, .017, Phosphor Bronze Wound .026, .035, .045, .056 /