Spicifically designed for Invisalign and Essex type invisible aligner trays to allow you a safe and sanitary place to store your expensive invisible aligner trays;Made of high impact heavy duty food grade FDA approve plastic;A slim sleek size and shape to make every day carry a breeze;Bonus inside lid mirror and true rotating hinge not the flex plastic hinge that has you participate in your cases destruction each time you have to open or close it.;The dry carry vent holes assures a mold free environment.