ENDLESS BUILDING POSSIBILITIES - Create an amazing roller coaster that stands 2.5 feet high! The K'NEX Thrill Rides Double Doom Roller Coaster Building Set allows your children to explore endless possibilities and develop their creativity as they build a real-life working replica of a roller coaster. Alternative roller coaster models can also be built by following the downloadable instructions. This building set is recommended for children ages nine and above.</br>MORE THAN 890 PIECES - This engineering education toy consists of 891 colorful parts of premium-quality construction. These include plastic rods and connectors connect to one another in different ways to build the Double Doom Roller Coaster. A track that serves as a railway for the two coaster cars is also included.</br>MOTORIZED CONSTRUCTION TOY - Build your own ride and watch it come to life! This toy set comes with a battery-powered motor that gives life and action to the connected K'NEX rods and pieces. Go beyond your imagination as you build and rebuild models that will take you on an amusement ride. This construction toy requires two "AA" batteries which are not included.</br>CONVENIENT STORAGE - You no longer have to worry where to put all the parts and pieces after playtime. This set comes with a sturdy box for convenient transport and storage.</br>STEAMaginationTM: ?It's the connection of STEAM (science technology engineering arts & math) with a child's natural curiosity and creativity and it powers the fun of each and every K'NEX building set. ?Building with K'NEX puts children on a path towards a fundamental understanding of STEAM/STEM subjects.</br>THRILL OF THE BUILD: K'NEX Thrill Rides allows each child to build bigger models that move to create an amusement park right in their home! ?Using the included parts and pieces each K'NEX Thrill Rides building set you can build a massive roller coaster a majestic spinning Ferris Wheel and more - the heart pounding fun is only limited by your imagination.</br>DEVELOPMENT BENEFITS: K'NEX supports key areas of a child's developmental growth. ?As they click the different parts together and discover how the building system works they're strengthening hand-eye coordination fine motor skills problem-solving skills spatial awareness and exercising their imagination!</br>PARTS GUARANTEE: Broken part? ?Missing part? ?If you find yourself in need of a replacement for any reason?? just give us a call! ?We'll get you what you need so that your child can get back to building as soon as possible.</br></br>Product Description</br></br><p>Bring the fun and excitement of an amusement park r