Medium 4 string set for bass guitar from XL Nickel Wound series comprised of mathematically optimized string gauge combination which results in greater control and playing comfort, with magnetic output that deliver a universally appealing and versatile tone for all playing styles. Round-wound strings deliver distinctive bright, booming tones and provide a more consistent feel for evenly balanced bending, fretting, plucking and slapping. Each string is precision wound with a nickel-plated steel wrap wire by digitally-controlled machine that ensure excellent intonation and unparalleled consistency. Package of the set is environmentally friendly and corrosion resistant so it keeps strings always fresh. D'Addario strings are made in the U.S.A. Gauges: .050, .067, .090, .120.