Deflecto Supurr Flex Clothes Dryer Transition Duct 4in x 50ft. Constructed with durable and fire resistant aluminum. Features a 4 inch diameter and 50 foot length. Flexible and easy to install. Features of Deflecto Supurr Flex Clothes Dryer Transition Duct 5-ply multi-layered flexible metallic duct Fire resistant Aluminum construction Dimensions: 4 inch diameter x 50 foot length Flexible and easy to install Package Contents: Deflecto Supurr Flex Clothes Dryer Transition Duct Deflecto F0450: Supurr Flex Clothes Dryer Transition Duct 4in x 50ft