The Pelican 1520 Case Black with Pick & Pluck Foam is an unbreakable, watertight, airtight, dustproof, chemical-resistant and corrosion-proof hard case used to carry any kind of equipment that needs to be protected from the elements. It is made of Ultra High Impact structural copolymer, which makes it extremely strong and durable. It includes a 0.25" (6.4mm) neoprene o-ring, ABS latches that seal perfectly, and an automatic purge valve for quick equalization after changes in atmospheric pressure.