Industry Leading DurabilityOur Plastic signs are made from 55 mils thick, tear-resistant HDPE (High Density Polyethylene) material. These plastic signs are perfect for indoors and limited outdoor use. These signs have a 2-year outdoor warranty, but most signs last longer. Our signs are laminated for enhanced performance. You can clean off graffiti and your graphics are protected. Our Meat Wash Only signs are better than comparable styrene signs, which become brittle and break.USA’s Oldest Sign ManufacturerFamily 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 ToSigns help you get away with personal intervention. Signs work 24 x 7, even when you’re not present and convey your message effectively.