Transport Case - Pelican 1450 - 371 x 258 x 152 mm - Foam Insert - BlackThe Pelican Protector Case Range uses an open cell core and solid wall construction, which is actually stronger and lighter than a solid core wall. Stainless steel pins are used for hinges and handles. Protector cases are watertight; the secret is the tongue and groove fit with Polymer o ring acting as a waterproof seal. Also, the new Automatic Pressure Equalization Valve releases built up air pressure while keeping water molecules out, resulting in a