High strength ABS & Zinc AlloysA selection of high strength ABS & zinc alloys, active parts imitate the state of the real engineering vehicle, working wheels with sliding function, enhance baby's curiosity through different patterns;FUN SCENE SIMULATION : these vehicles simulate the environment of a construction site, they can dump and turn, also can load sands. provides lots of fun, great for role play. Experience parent-child interaction and education, improve the relationship between parents and children, develop the child's hands-on ability and thinking ability. just driven by inertia and these miniature cars only take a big step forward with a simple push. They provide children with early development, shape recognition, problem solving and social skills. The set could stimulate children's imagination and encourage hand-eye interaction. You can set them as a birthday cake topper for kids who love construction vehicles. also perfect for Suitable for the gift of different festivals.