●Material:steel ●Size:The length is about 80-88cm, the error is about 2cm ●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 ●It is fit for professional guitar artiest and also for beginners, it is a great work to create great music with the replacement string. ●You do not need to cost time and money when you need to replace the string.