Features: Suitable for electric guitar. The metal guitar roller string trees is equipped with mounting screws. Easy to install. Prevent wear and tear on the strings which results in longer string life. Rolling designs improves string setup performances, helps tuning problems and reduce string breakage. Effectively fixing the strings to prevent them from slipping or sagging, providing a better playing experience. Specifications: Material: Metal Color: Gold/Silver Size: Approx. 10x3mm/0.39x0.12inch Package Includes: 2x Roller Guitar String Tree Guides Retainers note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.