Patented design for super-fast set up; Patented rectangular center strap design is the most accurate and realistic for optimum function, support, and long lasting durability; Patented oval tubing for faster set up and automatic alignment of the center frame; The center poles sit on a molded center support; The proprietary elastic bottom net band also speeds up net set-up, helps maintain consistent net tension, and takes stress off of the net to increase durability