The Ernie Ball Slinky Nickel Wound 12-String Guitar Electric Strings are made from nickel plated steel wire wrapped around tin plated hex shaped steel core wire. The plain strings are made of specially tempered tin plated high carbon steel producing a well balanced tone for your 12-string electric guitar. The strings are 39.5" in length, with gauges ranging from .008 - .040. 

As always, feel free to contact our store for more details, or with any questions.