Just like all of SKB's 3I Series Injection Molded Mil-Standard Waterproof Cases, the 3i-2317-14B-E is constructed of ultra high-strength polypropylene copolymer resin molding, featuring a gasketed, water and dust tight, submersible design (MIL-C-4150J) resistant to corrosion and impact damage. It also features a molded-in hinge; trigger release latch system; comfortable, snap-down rubber over-molded cushion grip handle; an automatic ambient pressure equalization valve (MIL-STD-648C); and resistance to UV, solvents, corrosion, fungus, and impact damage (MIL-STD-810F). To make life easier on your back, arms, and legs, it also comes with four wide set in-line skate style wheels and an industrial-strength injection molded pull-out handle.