Mandolin Strings. Features: D'Addario's most popular light gauge mandolin strings. 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 .010/.010, 014/.014, Phosphor Bronze Wound .024/.024, .038/.038. Environmentally friendly, corrosion resistant packaging for strings that are always fresh.