Here is another cool gift idea for young engineers. The TECHING V8 Engine comes with over 500 pieces and clear instructions for you to put everything together. It has a stainless steel and aluminum alloy construction and runs on a 3.7V 500mAh battery.
More gadgets like this: here
The assembly time is about 5 hours. This V8 engine measures 17.2 x 19.8 x 18cm.
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