Single wind standard vent. Eight heavy duty fiberglass ribs. High durable two piece bronze aluminum pole with over 0.08 in. wall thickness. Reinforced rib joints. Deluxe push lift system. Commercial grade. L x 108 in. W x 103 in. H. This heavy duty 9 ft. commercial grade umbrella by California Umbrella offers all the features a residential or commercial owner demands. Will hold up against anything you throw at it; it has the benefits of both worlds.