These guitar strings are made of copper alloy material, which is strong and can be used for a lasting time. Excellent workmanship and fine details assure its popularity and durability. Perfect guitar strings for string instruments such as folk guitar. Features -Color:Assorted Color -Material:Copper alloy -Size:11.90X10.70X0.70cm/4.68X4.21X0.28in - Diameter: 0.25mm; 0.36mm; 0.58mm; 0.76mm ; 0.99mm; 1.19mm - Copper alloy strings are professional, rust-proof, excellent hand feeling, strong corrosion resistance. - High durability. The string tension is moderate, the resonance is full, the penetrating power is strong. - Made of copper alloy material with maximum corrosion resistance and durability, the guitar strings high performance. - Sophisticated production, with , guitar strings are responsive and responsive, brings you more convenience. - Compatible with the color matching of various folk guitar. Guitar string is a good present for yourself or family and friends. Package list: 6 x acoustic guitar strings