D'Addario J80 Phosphor Bronze Octave Mandolin Strings, Medium, 12-46 Designed for use with octave mandolins of various scales Loopend construction for universal fit Preferred for its warm, bright, and well balanced acoustic tone Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .012/.012, Phosphor Bronze Wound .022/.022, .032/.032, .046/.046