This 6.5 x 6.5 foot square market umbrella features coated aluminum 1.5″ diameter center pole with a durable crank lift system. The canopy is made of 9 oz. marine grade fabric with triple stitched pockets for durability against the wind. The fiberglass ½″ diameter ribs are designed to bend to resist wind damage. These commercial grade umbrellas feature a two year commercial warranty.