Polyester Blend Features. 54' x 12' x 12' batting cage. Steel and fiberglass frame. Foam padding protects frame from damage. 1" polypropylene netting is durable and strong. Steel ground stakes provide rugged support. Built-in harness connects easily to pitching machine (not included). Recommended for ages 6 and up. 1-year manufacturer's warranty. Made in China. The Xtender batting cage from Heater Sports™ is an incredible 54' structure that's perfect for baseball or golf practice. Fiberglass poles assemble quickly and add strength and stability, and foam padding protects the frame from damage. Steel ground stakes are designed to provide optimal support. The Xtender also features a built-in harness that easily connects to your pitching machine.