Manufactured from lightweight but durable polyethylene, this clear ducting has been engineered for maximum elasticity and flexibility. Unaffected by moisture and most chemicals, this strong, 4-mil ducting is ideal for use with air scrubbers, negative air machines, and dehumidifiers. 500 feet per roll. 13 in. wide when flat, expands to 8.3 in. diameter when inflated. Cut to length.