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Reflective Signs Are Hard to Ignore Our aluminum signs have a reflective surface for extra visibility in dark and dim light conditions. Reflective surface means light thrown from headlights will reflect back making the sign more readable. 3M Diamond Grade [“DG”] Reflective 3M Diamond Grade reflective signs offer the brightest reflectance. Use when you really want your message to stand out. These are ideal for environments with lots of other visual distractions. 3M Diamond Grade signs come with a 12-year outdoor warranty. 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. Industry Leading Durability 3M Diamond Grade signs have a 12-year outdoor warranty, but most signs last much longer. Our 63 mil thick aluminum signs are laminated for enhanced performance. You can clean off graffiti and your graphics are protected. Unlike many other signs, our No Dogs Please Sign uses industry-leading 3M inks and not off-brand or other low-durability inkjet pigments that fade in a year or two.