Custom foam designed to fit Bolt 6 Lt Kits with up to two Bolt Receivers. Skb iSeries 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 trigger 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..