Material: with anti-rust coating for use; Length: each guitar string measures approx. 87 cm / 34.2 inches Package includes: 10 sets of acoustic guitar strings, each set has 6 strings in 6 different diameters; as spare parts in your bag String diameter: 1: 0.2 mm / 0.007 inches; 2: 0.3 mm / 0.01 inches; 3: 0.6 mm / 0.02 inches; 4: 0.7 mm / 0.027 inches; 5: 1 mm / 0.039 inches; 6: 1.2 mm / 0.047 inches Suitable for: the colorful guitar strings are useful for guitar beginners to remember and practice; also suitable for guitarists to make their acoustic guitar beautiful and impressive Color: Brass + Colorful Material: Copper Package Contents: 30 x Brass Strings 30 x Colored Strings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.