Acoustic Guitar String, Light Tension, Coated, Standard Tuning, Coating Material: Phosphor Bronze, Extended Life Treatment on Each String, Preserves Natural Tone and Feel of Uncoated Strings, High Carbon Steel Wire and Fusion Twist technologies that provide tuning stability and unmatched break resistance, stays in tune 131% better than traditional strings, lasts at least 4 times longer than traditional uncoated strings, resealable internal packaging for easy opening and unused string storage, gauges: .0120, .0160, .0240, .0320, .0420, .0530.