Easy to assemble gets you to the flying field quick. 3 rockets, all mini engine powered, can reach heights of 550 feet. Better keep your eyes open for this these little guys or they will be out of sight before you know it. Recommended Engines: 1/2A3-4T (First Flight), A3-4T, A10-3T Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, igniters and recovery wadding are required - sold separately-unless otherwise specified.