These ATA Spec 300 shipping containers are constructed of white high density polyethylene to provide a safe, economical way to ship valuable electronic devices, personal computers and peripherals, cameras, video equipment and other sensitive equipment. The construction and finish of these cases allow them to withstand temperature variations of -180°F to +180°F. The rubber gasket tongue-in-groove valance seals out dirt and moisture protecting your products against the elements. A variety of 74 sizes provides dimensional choices for any need.