Pelican cases are kept watertight through the use of a tongue and groove fit and a polymer o-ring. Pelican cases come standard with an Automatic Pressure Equalization Valve which releases built up air pressure while keeping water out. Pelican's Pick N'Pluck foam lets you customize the interior. Stainless steel reinforced padlock protectors Single folding front handle with no-slip overmolded cushion grip Pelican Protector Cases are made with Copolymer Polypropylene, using an open cell core and solid wall construction, which is stronger and lighter that the competion. You can tell its a Pelican case by the distinctive "twin-ribbed" top surface. Stainless steel pins are used for hinges and handles. The new Double-Throw latches are much easier to open.