This 7.5 Ft. octagonal aluminum rib market umbrella has a sturdy 1.5” diameter center pole and 1/8” square ribs with stainless steel parts and a silver mist coated frame. The pulley and pin system makes this umbrella easy to close for overnight storage. The heavy duty 9 oz. marine grade fabric is built to withstand 24/7 outdoor exposure. Every detail has been considered in the construction of the umbrella: the square ribs have resistance against abuse, the silver mist coating provides protection against U.V rays, the pockets are triple stitched so they aren't torn, and the ball top protects the umbrella when being dropped.