This 6.5 Ft. square market umbrella has an aluminum 1.5” diameter center pole and 1/8” square ribs. Our Aluminum Rib Market Umbrellas have stainless steel parts and a silver mist coating for protection against the sun and salty air. The pulley and pin system is easy to use, making it easy for over night storage. This umbrella features 9 oz. marine grade fabric that is made for commercial applications. The square aluminum ribs and triple stitched pockets are durable against weather and rough handling. Give us a call to discuss getting a sample or quantity discounts.