Over 100 years of Guitar String Making Tradition!Black coated acoustic strings, provide an even longer life to Black Diamonds superior duration. The coating will protect your strings from hand oils that can cause premature wear. All six strings are coated to give full protection and a balanced feel. Gauges: .011, .015, .022(w), .032(w), .042(w), .052(w) All wound strings are black coated for long life