Build, customize, and soar! The Turbo Jet 2-in-1 Building Set from K'NEX lets your children design and create the jet planes of their dreams. With 402 K'NEX pieces, your kids will love building a turbo jet plane and heli-plane with this set. This set contains K'NEX rods and connectors, plus special motorized moving parts like wheels, helicopter rotors, and more to complete the turbo appearance of each plane. Additionally, the K'NEX Turbo Jet Two-in-One Building Set has easy-to-follow, step-by-step building instructions for the two alternate turbo models to guide your children in constructing their own jet plane and heli-plane. This set also comes with a battery-powered motor to operate the customized models, which require 2 "AA" batteries that are not included.Help your kids increase their knowledge of STEAM (science, technology, engineering, arts, and math) concepts by firing up their natural curiosity and creativity. Building with K'NEX puts children on the path toward a fundamental understanding of STEAM subjects. Let them enjoy non-stop interactive excitement while they design, construct, and customize their own K'NEX models!