Material: with rustproof coating for durable use; Length: each guitar string is approx. 87 cm/ 34.2 inch Package includes: 2 sets of acoustic guitar strings, each set has 6 strings in 6 different diameters; Good as spares in your bag String diameters: 1: 0.2 mm/ 0.007 inch; 2: 0.3 mm/ 0.01 inch; 3: 0.6 mm/ 0.02 inch; 4: 0.7 mm/ 0.027 inch; 5: 1 mm/ 0.039 inch; 6: 1.2 mm/ 0.047 inch Suit for: colored guitar strings are helpful for the guitar beginners to remember and practice; Also fits for guitarist to make their acoustic guitar look beautiful and awesome Color: Brass + Colorful Material: copper wire Package Contents: 6 * brass strings 6 * color strings Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.