Instrument Cases are fabricated from .090" 5052 Aluminum sheet, and finished with a textured powder coat.The TIG welded constuction, the one piece valance gasket, and the automatic pressure equalization valve, makes these cases airtight and watertight. They Feature lockable Frantzen latches and Penn hinges with an integral lid stay. The interior is a perfect fit, machined Polyurethane Esterfoam insert. These cases are expertly made, and are of the highest quality, for the ulimate in protection and security.