DIY Engineering Vehicle Set 4 Models Screw Nut Assembly Truck Inertia Light Sound Backpack Toy Gift for Kids

DIY Engineering Vehicle Set 4 Models Screw Nut Assembly Truck Inertia Light Sound Backpack Toy Gift for Kids. 4 DIY Vehicle Models: Includes Excavator, Crane, Dump Truck, and Concrete Mixer with 21-30 pieces each. Inertia Drive & Sound: Vehicles glide with inertia and feature synchronized light and music effects. Motor Skills Training: Assembling screws and nuts improves fine motor skills and hand-eye coordination. Convenient Backpack Storage: Comes with a backpack for easy storage, carrying, and cultivating organizing habits. STEAM Education: Teaches mechanical structures, transmission principles, and career awareness. Safety Certified: Certified with EN71, CD, HR4040, 10P, and ASTM for non-toxic, eco-friendly play. OEM & ODM Support: Full customization, minor customization, and flexible customization options available. Sample Orders Accepted: Supports sample purchases for quality testing and small batch trial orders.