Adjustable rotate button potentiometer is a manual elements with manual control. Can control the effect of a variety of functions, such as level, speeds, voice, etc. Can be used for synthesizers, electric guitar, etc. Features - Color: Assorted color.- Material: Bakelite.- Size: 2.30 x 2.30 x 1.70cm/ 0.90 x 0.90 x 0.67 inch.- Easy installation, not easy to age, sturdy material, inner hole copper core, dustproof and anticorrosive.- Potentiometer rotary knob is useful for connect the rotary potentiometer, usually multiturn linear potentiometer which always use as volume control switch.- Replacement part for audio device, round shaft can be push on it easily.- The knob made from bakelite, lightweight design, exquisite appearance, practical and durable.- These knobs are solid, wear resistant, and the service life is ideal.Packing list: 10 x knob caps