The Power & Go Racers Building Set from K'NEX lets your children design and create vehicles that really move. With 166 K'NEX pieces, your kids will love building 15 different wheeled, motorized vehicles with this set. This set contains K'NEX rods and connectors, plus two spring motors. Additionally, this building set has easy-to-follow, step-by-step building instructions. 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!