These items are some guitar roller string tree, made of metal, they are not easy to be break and rust. They can increase the tension of the angle and chord of the string. The main function of the guitar string buckles is to increase the pressure angle of the strings, increase the pressure of the strings on the pillow, and make the sound stronger. Feature - Color: Golden. - Material: Metal. - Size: About 1.30X0.70X0.20cm/0.51X0.28X0.08in. - Made with metal, with high hardness, and wear resistance, making it more durable, and . - The guitar string retainer also can prevent wear and tear on the strings, which results in longer string life. - Retain the string perfectly, great replacement part for your broken, dirty or old string retainer. - The string guides help minimize tuning problems and overtones caused by low string tension. - Compatible with electric guitar. It is a necessary instrument replacement part for electric guitar players, lovers and learners. Package list: 4 x spacers 4 x screws 2 x long 2 x shorts