These cases are designed rugged and to travel the harshest environments on earth. Against the extreme cold of the artic or the heat of battle, Pelican cases have survived. Made in the USA, these tough cases are designed with an automatic purge valve, that equalizes air pressure, a watertight silicone O-ring lid, over-molded rubber handles and stainless steel hardware. Features strong polyurethane wheels with stainless steel bearings.