D'Addario EJ17-10P Phosphor Bronze Acoustic Guitar Strings Medium 13-56 - 10 SetsEJ17s offer heavier tension resulting in a bolder, more resonant acoustic tone with higher resistance for heavy strumming and flat picking. Buy 10 sets and save! Specifications Buy 10 sets and save with this environmentally friendly, corrosion resistant 10 pack D'Addario's most popular choice for heavy strumming, flat picking and resonant, projecting tone Preferred for its warm, bright, and well balanced acoustic tone Made in the U. S. A. for the