This 7.5 foot aluminum rib market umbrella has a 1.5” diameter aluminum pole and 1/8” square ribs. The square ribs provide a sturdy foundation to better withstand abuse from weather. The stainless steel parts and a silver mist coated frame provides protection against UV rays. The pulley and pin system is easy to use and the heavy duty cord is resistant to sun damage and fraying. Call us to try out a sample.