The Portable Tetherball System (90029) from Lifetime Products brings another childhood playground game to the convenience and safety of your own backyard. With a soft-touch ball and nylon cord, a heavy-duty portable base, and durable weather-resistant construction, Lifetime's Tetherball System is safe for children, but strong enough to stand up to aggressive play. The portable system easily rolls to any space on the lawn or driveway, and because it doesn’t require a cement base, it is easy to store and setup. With the Lifetime Tetherball System, fun is just a swing away.