Industry Leading Durability Our Plastic Folding signs are made from durable polypropylene material. Hazard Sign has an easy grip handle with reinforced ribbing for extra strength. FloorBoss signs are 2-sided. Two message panels fit into each side. Panels can be permanently locked into place (with rivets included with your order) or can be swapped out modularly. Our Caution - Tripping Hazard Folding Floor signs are better than comparable lightweight corrugated or flat folding signs. USA's Oldest Sign Manufacturer Family owned since 1918, we take immense pride in our signage. Being one of the oldest certainly means we know this business in and out. Our South Dakota factory is the oldest manufacturer of metal signs in the USA. We have been an integral part of safety and convenience our signs have provided over the years. Signs Give a Warning – So You Don't Have To Personally warning people is not always the right solution. Say it with signs! Signs are the safest and the most effective medium to reach out to maximum people on your property.