There are 2 sets of strings in this package | Normal tension, string gauge: .028, .032, .040, .029w, .035w, .043w | Plain strings are made of high-grade clear nylon, winding material of this set is silver plated copper, which gives a silvery white appearance | Provides a bright, clean timbre | With anti-rust coating, these strings last much longer (compared with uncoated strings)