D'Addario NB1252BT Nickel Bronze Acoustic Guitar Strings, Balanced Tension Light, 12-52 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. NB1252BT delivers the ideal balance of volume, projection and comfortable playability - with string tension balanced across all six strings. String Gauges: Plain Steel .012, .016, Nickel Bronze Wound .022, .030, .039, .052