Feature:1. For 39 Inch Guitar: Improve your guitar tone, volume, and sustain with this guitar string tuning system, designed specifically for 39 inch guitars, providing precise tuning and enhancing your playing experience.2. Metal Structure: Made of excellent metal, this tuning system fits securely on your 39 inch guitar, ensuring stable tuning and improved intonation. Experience a fuller, richer sound with this simple but effective upgrade.3. Good Performance: This tuning system optimizes string tension, resulting in improved tone, increased sustain, and enhanced playability. Take your playing to the next level with this innovative upgrade.4. Accurate Tuning: Install it on your guitar to achieve accurate tuning, enhanced resonance, and extended sustain. Unlock new possibilities and enjoy a more satisfying musical experience.5. Compact Design: This guitar string tuning device has a compact size and light weight, which will not increase the burden on the guitar after installation, suitable for guitar beginners or enthusiasts.Specification:Item Type: Guitar String Tuning SystemMaterial: MetalApplicable Range: Fits 39 Inch GuitarsSize: Approx. 51 x 22 x 11mm / 2 x 0.9 x 0.4in.Package List:1 x Guitar String Tuning System1 x English User Manual