... M1 Material: alloy steel and ABS Characteristic: double layer WW2 US Double Layer M1 Helmet 1. Product Basic Details Mode ... penetration, shock, fireproof and heat insulating. Protect head in many ways such as military training, motorcycling, building, ... customized3. Production ProcessKeeping abreast with the latest advancements in technology, being strong backed by 5engineers and technicians, ...