NB060 is a .060 gauge Nickel Bronze wound acoustic guitar string. Perfect as a replacement string or for creating custom sets. Nickel Bronze strings are the premium uncoated acoustic strings by D’Addario. Featuring an innovative combination of nickel-plated phosphor bronze wrapped onto a high carbon NY steel core, these strings bring out the unique tonal characteristics of any guitar, allowing its natural voice to truly shine. Nickel Bronze delivers unrivalled clarity, resonance and projection, as well as outstanding balance and harmonically rich overtones.