"We use several layers of fiber reinforced plastic to make it stronger, than cut and add some details of very strong epoxy material. After it's custom painted (we experimented and got even effect of hummered bronze). That's why each mask made from the same mold will be unic. Than we place strong strikeball glasses inside (right now we can use clear, yellow or sunglasses). There is some space between glasses and the mask, to make sure it won't get foggy."