This items are some guitar head pressure chord buttons, made of metal, they are not easy to be paint-shedding and rust. they increase the tension of the Angle and chord of the string; Fine workmanship, high gloss, easy to use. They increase the tension of the angle and chord of the string. Feature - Color: golden. - Material: iron. - Size: About 1.5x1x2 cm/0.6x0.4x0.02 inch. - Premium metal material, you will use them for a long time. - They have the fine workmanship, the good glossiness. - They increase the tension of the angle and chord of the string. - Help to lessen the stress on the guitar strings, reducing the wear on the strings for longer life of the strings. - Come with screws, easy to install.