Description: - 【Guitar Roller String Tree】Help the guitar reduce the pressure on the strings, reduce the wear of the strings, and prolong the life of the guitar strings. - 【Material】Roller string guides are made of high quality metal material, strong and wear resistant, durable. - 【Function】String retainer guides provide high performance for the guitar, keep the tone for a longer time, it is the perfect accessory for the guitar. - 【With Screw】String tree guides retainer comes with mounting screws, which is convenient for you to install and use. - 【Guitar Parts】Used to replace old or broken guitar string retainers. Specification: - Material: Metal Size Chart: Packing Size: 8cmx8cmx4cm/3.15inchx3.15inchx1.57inch Package Includes: 6 Screws 6 Ferrule 6 Nuts Note: Please allow slightly errors due to manual measurement and different monitors.