GHS regular classic guitar strings, it has Tynex-Nylon Trebles/Silver Copper Basses: The industry standard for classical strings. The tie end basses provide a brighter tone. The Ball end basses are mellower and facilitate intallation. Tynex-Nylon Trebles/Phosphor Bronze Basses: Same as above except the phosphor bronze basses provide a brighter tone. Gauge 28- 32 - 40 - 29w - 34 - 43