100% kid-powered. No batteries required. Great for year round fun to get kids away from screen time and more active outside. Award-winning products from industry experts, including iParenting Media, Dr. Toy, and Creative Child Magazine Pair with Stomp Rocket Science book and get kids interested in STEM subjects early. Ages 5 and up Run, jump and STOMP to launch these rockets up to 200 feet in the air -- that's 20 stories high! Stomp Rocket Ultra is strong and durable, and great for active, outdoor play. Includes 4 foam-tipped Ultra Stomp Rockets and a Stomp Launcher. No batteries required; easy, fast assembly.