XL ProSteels are D’Addario’s brightest bass guitar strings. The unique, highly magnetic alloy in ProSteels delivers super-bright tone with magnified presence and attack. Made with a high carbon steel core and stainless steel wrap wire, ProSteels produce enhanced interaction with magnetic pickups, offering a palette of harmonically rich, brilliantly penetrating highs, combined with pronounced, tight-and-tough lows. 45-100 Regular Light is our most popular bass gauge, providing a perfect blend of response and playability. Features:- •\tOne of D'Addario's brightest and most corrosion resistant strings offering harmonically rich, deep and penetrating tone •\tFits long scale basses with a string scale length of up to 36 7/8 inches •\tMade in the U.S.A. for the highest quality and performance •\tString Gauges: Wound .045, .065, .080, .100 •\tEnvironmentally friendly, corrosion resistant packaging for strings that are always fresh