Imagine how it would feel to have a contractor run duct tape across your perfect ceiling, or a drive in a row of staples or screws just to create a tight seal with plastic sheeting? With the Foam Rail™ cross bars you'll never have to find out. The Foam Rail™ cross bar works with the SLP™ or Kit 20 poles to create a virtually airtight seal by pushing its foam edge against the plastic and ceiling. Each rail is 5 feet long and is made of strong, lightweight aluminum. The spring loaded pole holds it in place and it takes just seconds to install with out damaging a thing.