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From the Manufacturer As a tribute to the late great Estes model rocket designer, Mike Dorffler, this rocket is for him. He designed the Astron Sprint back in the day and as a way to honor his memory, we have introduced an "XL" version of one of his great creations. A sleek design and pretty straight forward building. Sure to be a collector's item. 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.