Medium strings for acoustic guitar. Cryogenically frozen with a blast of liquid nitrogen, which tighten the molecules, minimizing microscopic gaps. This process removes transient frequencies that produce harsh highs and muddy lows, creating a more consistent string, with true tone and longer life. Precision wound with proprietary alloys specifically developed to deliver fantastic sound, and super-long lasting. Features set of six strings. String size: .013 / .017 / .026 / .036 / .046 / .056.