These 9 foot tall columns come in a pair. The center 3 rings rotate, while the top and bottom remain stationary. When all 5 are aligned on both columns, and output is operated. Can be used to control mag locks, solenoid boxes, lighting, hidden passages, anything you can imagine. The art work and colors can be customized to fit your room. These are just.. impressive when they are set up and they are really beautifully done.