The Bogen AutoPole Background System is easy to use in your studio or on location. The heart of the system is the adjustable two-section AutoPoles, which extend from 6' to 11' 4". Simply place these lightweight aluminum poles into position, raise the top section to the ceiling and with the lever-action lock secure safely into place. Each set includes two extendable poles. The Expan Drive Set is the chain-operated background drive that makes it easy to raise and lower cored seamless paper of any length.