12-String Acoustic Guitar Strings, Light Tension, Coated, Standard Tuning, Coating Material: Phosphor Bronze, Extended Life Treatment on each string, preserves the natural tone and feel of uncoated strings, High-Strength Steel Wire 131% carbon content and Fusion Twist technologies that provide tuning stability and unparalleled resistance to breakage, stay in tune better than traditional strings, last at least 4 times longer than traditional uncoated strings, resealable internal gasket for facilitate opening and storage of unused strings, gauges: .0100, .0100, .0140, .0140, .0230, .0080, .0300, .0120, .0390, .0180, .0470, .0270.