4U removable injection moulded shock rack cage 13-inch rack depth Interior foam protection Ultra high-strength polypropylene copolymer resin case construction UV, solvent, corrosion and fungus resistance (MIL-STD-810F) Complete gasket seal makes these cases absolutely watertight (MIL-STD-C-4150J) Automatic ambient pressure equalization value (MIL-STD-648C & IP67) Moulded-in hinges TSA Acceptable trigger release latch system Rubber over-moulded cushion grip handles Locking loops to