Here is another building kit that introduces your kids to engineering and STEM concepts. The Eitech Motorized Crane Building Kit has over 960 pieces and comes with everything needed to build cranes up to 3ft tall, including 3-way cable control, 3 gear motors and a ball bearing joint.
More gadgets like this: here
This kit comes with step by step illustrated instructions. The pieces are made of high grade polished steel.
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