Item Type: Guitar String RetainerMaterial: Iron 1IRON MATERIAL: The string guide is constructed of iron, which is resistant to wear and tear and is strong and durable for a long time. 2GUITAR STRING RETAINER: The string guide is used for electric guitar headstock pressing and can help you play more comfortably. 3EASY INSTALLATION: The small size of string guide and the simple installation method allow even novices to quickly get started and complete the installation. 4COMPACT SIZE: Because of its compact size, the string guide is very portable and can be used to finish pressing the guitar anywhere, anytime. 5FINE WORKMANSHIP: The string guide is exquisitely made, with a smooth surface and no burrs, and the screws have clear threads and are firmly fixed.