Corrugated plastic is a lightweight, twinwall plastic material that is suitable for both indoor and outdoor signage applications. Our white corrugated plastic panels are 4 mm (3/16") thick.
I found the megaphones while searching for another item, so glad I did. We used them for our senior day. Added a photo of the girls (which we laminated), vinyl names, year and some stars. It was not the nicest day here in NJ this past Saturday and was glad that these were waterproof and lasted through the football game.