Heavy-duty rotational-molded polyethylene shells with 15% thicker corners, unique molded-in bumper system so hardware and valance are "drop-protected". Cases are stackable, rugged with key locking latches, full-length piano hinge, built-in TSA accepted combination lock and a provision for padlock or cable tie. Wheels and telescoping handle included for easy travel. Quality sewn and riveted pallets included.