Durability: Our aluminum signs come with an outdoor warranty of 7 to 12 years. In reality though, these signs last for decades outdoors without fading or warping. Tear-resistance: Unlike paper or other thin elements, aluminum signs are 63-80 mil thick and would not tear, split, bow, or shatter. Strength: Lightweight yet rigid, aluminum signs are proven to outlast the toughest of storms. Weather-resistance: Unlike steel, aluminum signs are rust-proof and waterproof, and therefore weather-resistant. Professional: Digital or screen print looks very professional on aluminum signs