Gold Plated Alice A107BK-H Nylon Classical Guitar Strings; This set is a combination of black plain strings and bronze color wound strings(with our anti-rust coating),the contrast brings out a different feel of playing,plus a unique look.With anti-rust coating,these strings last 4-5 times longer before oxidation sets in. A Production of automatic winding machines,consistent in quality and performance. Hard Tension. (.0285 .033 .041 .030 .036 .044). Clear Nylon; Nylon core; Coated Copper Alloy Winding. Alice produced, more professional, quality guaranteed, the international famous brand.