SKB's injection molded 61-key keyboard case is a part of their i-Series of waterproof cases which are constructed of ultra high-strength polypropylene copolymer resin and feature a gasketed, waterproof and airtight, submersible design (IP67) that is resistant to corrosion and impact damage. Its stainless steel molded-in hinge, patented "trigger release" latch system, TSA-accepted-and-approved locks, comfortable, snap-down rubber over-molded cushion grip handle, secure stacking, and automatic ambient pressure equalization valve (MIL-STD-648C) all contribute to its military grade design.