Have a framework made of aluminum or steel pipes that support the fabric roof and define the shape of the structure. The rigid framework allows the tent to be free-standing without additional support, but requires the same rope or cable anchoring system as a pole-supported tent to hold it in place, as specified by applicable fire or building codes. Pipe frame-supported tents are popular for events that require smaller tents. Most manufacturers make units as small as 10 feet by 10 feet that are easy to set up and tear down. They are also suitable for smaller events that require few, if any interior obstruction since the frame system makes interior supports unnecessary. Pipe frame-supported tents are available in a wide variety of styles and sizes.