Made for long-scale electric basses, DR Strings PB5-130 Pure Blues Medium strings feature a round stainless-steel core that guarantees a sustain-rich foundation and flexible playability, while the winding has been made from a specially developed quantum-nickel alloy to help boost the already tight and defined sound of steel. This pack includes gauges .045 - .065 - .085 - .105 - .130 for a trusty feel with a slightly tighter-feeling low B.