There is an entire industry built around the design and sale of trade show displays. Many companies that sell trade show displays have elaborate showrooms in major cities, and other companies sell displays over the Internet without a showroom. Typically a trade show display company will specialize in one type of trade show display. Internet companies tend to specialize in modular, portable, and hybrid trade show displays, while companies with large showrooms typically specialize in custom exhibit booths. To cut the costs of the exhibits, display manufacturers often use what is known as “exhibition systems” to build walls of the booths and add tailored elements manufactured from plastic, wood etc. to create a unique look of display.