Product Description 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. Made for 5-string basses, 45-130 Regular Light gauge strings take our most popular bass gauge and add a low B-string. From the Manufacturer EPS170-5 is the 5-string version of D’Addario best-selling ProSteels bass set. With the addition of the .130 low B string, EPS170-5 offers the ideal combination of biting high end, punchy lows and super long life. Fits long scale basses with a string scale length of up to 36 1/4 inches. ProSteels are D'Addario's brightest and most magnetic bass strings. A specialized steel alloy delivers harmonically rich, brilliant high-end coupled with deep, tight lows that work in tandem to create the coveted "Piano tone" steel players crave. Great for both articulate fingering or aggressive picking, ProSteels give you the extra edge and punch you need to cut through the mix.D'Addario, the world's largest manufacturer of musical instrument strings, is known as The Players Choice with a reputation for unsurpassed quality and consistency. D'Addario's innovative packaging reduces waste and provides protection from corrosion. All D'Addario strings are manufactured in the U.S.A. using proprietary, digitally controlled, state-of-the-art machinery for unmatched performance, set after set.