Why is the helmet made of plastic?
The highest cost performance, and high strength, light quality, does not affect the work
The synthesis is relatively easy, so the price is relatively low. There is also a motorcycle helmet if it is plastic, iron, in the motorcycle change motion, due to inertia, neck pressure is big. Additional recommend: you can go to see the role and benefits of the alloy.
Plastic is a synthetic organic substance, which can be designed according to practical applications;
