DIY Engineering Screw Vehicles toys high quality (290A-3)

DIY Engineering Screw Vehicles toys. 

The set includes multiple construction vehicles, such as a dump truck, an excavator, and a bulldozer. 

They are friction-powered, meaning no batteries are required for movement. 

The toys can be assembled and disassembled using a child-friendly screwdriver, promoting STEM learning. 

They are made from high-quality, durable, and safe materials