Our tetherball posts are manufactured of heavy-duty, galvanized steel for maximum strength and durability. Installed posts stand 10 feet and come with a welded cap. Each post is equipped with a 3/8" plated eyebolt, 30" plated chain (7/32" dia.) and a swivel snap for ball attachment. Our tetherballs are regulation size and shape and are manufactured of a fully molded butyl bladder and nylon.