Feature:1. Designed for beginners, play aid introduces the concepts of "universal chord" and "series" so that novices can play songs quickly and smoothly through self-study.2. Instead of pressing the strings with your left hand, reduce the pain of your finger.3. Remember that color means to memorize the strings, it is no longer difficult to remember.4. Improved chord conversion performance and smoother playing.5. Train your fingertips to exert force vertically and nurture the correct hand shape. Specification:Color: BlackMaterial: Nylon PlusUsage: 23 inch/26 inchSize: As shownPackage Included: 1*Chord BoosterNotes:1. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3cm measurement deviation due to manual measurement.