D'Addario J74 Mandolin Strings, Phosphor Bronze, Medium, 11-40 D'Addario's best selling mandolin set Loopend construction for universal fit Phosphor Bronze for long lasting, warm and bright tone Made in the U.S.A. for the highest quality and performance String Gauges: Plain Steel .011/.011, 015/.015, Phosphor Bronze Wound .026/.026, .040/.040