9 ft. Dia Terrace Umbrella has (8) flexible fiberglass ribs, molded nylon joints, hubs and end tips for strength that improves the performance of the umbrella during adverse weather conditions. The Terrace umbrella has a 2-Piece 1.5 in. Dia powder-coated aluminum pole. This model has a crank and push button tilt. The cover is a Spun Acrylic that is durable and partially protects from rain and harmful sun rays.