Material: with rustproof coating compatible with durable use; Length: each guitar string is approx. 87 cm/ 34. 2 inchPackage includes: 2 sets of acoustic guitar strings, each set has 6 strings in 6 different diameters; Good as spares in your bagString 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 inchSuit compatible with: colored guitar strings are helpful compatible with the guitar beginners to remember and practice; Also fits compatible with guitarist to make their acoustic guitar look beautiful and awesomeColor: Brass + ColorfulMaterial: copper wirePackage Contents:12 * brass strings12 * color stringsOnly 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.