Made of colorful coated copper alloy. Long service life. Tunes stable, sounds great. Suitable for acoustic guitar. Make you guitar more perfect. Good tools to replace your guitar string, good gift for guitar beginner. Item Name: Guitar Strings Material: Steel, Copper Alloy Quantity: 6 Pcs in 1 Set String Length: E String (1st): 88cm/34.65" (Approx.) B String (2nd): 88cm/34.6" (Approx.) G String (3rd): 90cm/35.43" (Approx.) D String (4th): 90cm/35.43" (Approx.) A String (5th): 85cm/33.46" (Approx.) E String (6th): 85cm/33.46" (Approx.) 6 Different Colorful Strings Standard: E String (1st) 0.011"(0.28mm) Stainless Steel B String (2nd) 0.015"(0.38mm) Stainless Steel G String (3rd) 0.024"(0.61mm) Red Bronze Wound D String (4th) 0.032"(0.81mm) Yellow Bronze Wound A String (5th) 0.042"(1.07mm) Blue Bronze Wound E String (6th) 0.052"(1.32mm) Green Bronze Wound Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 6 x Guitar Strings