Simply hit the ball and the elastic cord returns the ball back to you; the cord stretches up to 30ft and can be wrapped around the base for shorter rebound. The Fill n Drill is easy to fill/empty, with a non-skid base that is the heaviest on the market once full, making it ideal for use in the driveway, garden, basement, garage or for taking with you to the park or court. The ball and cord store neatly into base for storage in a bag.