One set includes strings 1 through 6. The other two sets are missing the 3rd string. Therefore, it is a set of 16 strings: 6 + 5 + 5. Acoustic guitar strings, bronze light gauge, 3 sets included, with the size of each string clearly indicated. - Model Name: SY1000L-3 - Type: Acoustic Guitar Strings - String Type: Bronze Light Gauge - String Sizes: E: 0.30mm, B: 0.41mm, G: 0.61mm, D: 0.81mm, A: 1.07mm, E: 1.32mm - Number of Sets: 3 sets Thank you for looking.