SKB 3I Series Injection molded mil-standard waterproof cases are molded of ultra high-strength polypropylene copolymer resin, featuring a gasketed, water and dust tight, submersible design that is resistant to corrosion and impact damage. Features a molded-in hinge, patented\ rigger release\\latch system, comfortable, snap-down rubber over-molded cushion grip handle, automatic ambient pressure equalization valve, resistance to UV, solvents, corrosion, fungus and impact damage.