The innovative design of this cargo identification kit will save you time and make sure you are always DOT compliant. It is made entirely of metal and designed in a book style format, enabling you to change cargo identification quickly, and without tools or tapes. To change the identification placard you are displaying, just flip to the one you want like a book. Four quick release fasteners hold your chosen placard in place. The hinges and fasteners are made of stainless steel for extended product life. The base and placards are made of aluminum. The 6 in 1 cargo identification kit comes standard with the following placards: Non-Flammable Gas, Oxidizer, Corrosive, Dangerous, Poison, and Drive Safely.