4WD OffRoad Car DIY Engineering & Motion Educational Stem Toys with Instruction Book. The 4WD OffRoad Car Kit lets kids build their own rugged, highenergy vehicle while learning the fundamentals of mechanics and motion. The instruction book guides them through assembling the chassis, wheels, and body, helping them understand how structure and movement work together. This handson STEM activity boosts critical thinking, coordination, and creativity as children test and explore their finished model. A thrilling project for young car enthusiasts and future engineers.