Features: It\'s widely used in television, video, Mp3, Mp4, VCD, DVD, telephone, office automation equipment, information communication equipment, etc. A common element in electronic devices is a three-terminal resistor with a continuously adjustable tapping point controlled by rotation of a shaft or knob. Adjustable resistors come in many different resistances and sizes to suit the PC board or front-panel layout. A resealable transparent plastic box with a label on the surface is provided, you can identify the resistor you need conveniently. Total 100 pieces in one set, 10 pieces for each type, which can be used for a long time.