"Wet Floor / Slippery When Wet" Reversible Floor Sign By SmartSign | 11" x 20" Plastic DURABLE PLASTIC. Signs are made from corrugated plastic and are waterproof. REVERSIBLE. These signs combine two signs in one, offering versatility. Flip and fold the sign inside-out to display the other message, which is printed on the inverted panels. EASE OF USE. Signs have a handle cut out for easy carrying and storage. PROMOTE SAFETY.Signs speak volumes about your commitment to everybodys well-being by promoting safety.