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Sturdy 7.9" plastic base (1.9" tall) includes a valve for you to open and fill with water or sand so the trainer will not move while you're training. The bottom of the base features two non-skid pads for maximum strength. The included elastic cord stretches from 13-22 feet (the cord comes attached to the balls). Attach the cord to the hook and hook the cord to the base. Quick and easy set up. Kids and adult beginner tennis players will appreciate a practical gift. Improve skills, score an ace and spread the love this birthday or Christmas!