XL ProSteels are DAddarios 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. This 45-105 Regular Light Top/Medium Bottom gauge set has a great mix of tighter low-end with a comfortably balanced, bright top. 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. DAddarios brightest bass guitar string. Stainless steel wrap wire produces enhanced interaction with magnetic pickups, offering a palette of harmonically rich, brilliantly penetrating highs, combined with pronounced, tight-and-tough lows. Like all DAddario electric bass strings, XL ProSteels are made with our proprietary Hex-Core, ensuring perfect intonation, consistent feel, and reliable durability. XL ProSteels sets have a code on the recyclable VCI bag, which you can register to earn Players Circle points. DAddario bass guitar strings are made in the USAdrawn to our exacting specifications at our New York production facility.