Strings for 12-String Acoustic Guitar, Light Tension, Coated, Standard Tuning, Cover Material: 80/20 Bronze, Extended Life Treatment on each string, preserves the natural tone and feel of uncoated strings, Steel Wire with high carbon content and Fusion Twist technologies that provide tuning stability and unmatched resistance to breakage, stays in tune better than traditional strings, 131% lasts at least 4 times longer than traditional uncoated strings, lockable internal packing resealable for easy opening and storage of unused strings, gauges: .0100, .0100, .0140, .0140, .0230, .0080, .0300, .0120, .0390, .0180, .0470, .0270.