Acoustic Guitar String, High Tension, Finish: Tie-End, Coated, Standard Tuning, Nylon Wrapped with Silver Copper, Extended Life Treatment on Each String, Preserves the Natural Tone and Feel of Uncoated Strings, Patented Composite Bass and ProArte Treble, dynamic response with long-lasting performance, lasts at least 4 times longer than traditional uncoated strings, internal resealable packaging for easy opening and storage of unused strings, gauges: .0285, .0327, .0410 , .0290, .0360, .0460, ideal for jazz and classical.