Super long version of D'Addario's top-selling heavy gauge ProSteels bass set. D'Addario's brightest and most magnetic bass strings offering harmonically rich, deep and penetrating tone. Fits super long scale basses with a string scale length of up to 38 inches. Made in the U.S.A. for the highest quality and performance. String Gauges: Wound .050, .070, .085, .105. Environmentally friendly, corrosion resistant packaging for strings that are always fresh.