This 7.5 x 7.5 square market umbrella features a commercial grade 1 1/2″ aluminum pole with 1/2″ fiberglass ribs. Uses a heavy gauge crank lift system that is easy to use. The canopy is made of 9 oz. Marine grade fabric with triple stitched pockets for security against winds. This is the only crank umbrella on the market with a commercial warranty!