These robust cases come with purge valves for an airtight seal, ribbed ABS construction, stainless steel hinge pins, O-ring seals and very solid catches. The lids are lined with removable egg-shell foam and they come with pluck foam insert with an extra layer of egg-shell foam. These are truly exceptional cases that you should have no qualms about entrusting your camera gear, test, medical or scientific equipment. 3 year warranty.