Aluminum Signs Panels, aka aluminum sandwich boards, are printed with UV inks and comprised of two.020" aluminum sheets with a polyethylene core, resulting in a total thickness of 1/8" (3mm). They are lightweight and come in two pre-painted colors: White & Brushed Silver. Drill hole options are available for quick and easy attachment to posts, fences, walls, and a variety of surfaces. Aluminum Signs Panels are suitable for both indoor and outdoor use. Common uses include real estate signage, customer/handicap notices, directional signs, and much more. You can check or order aluminum sign panels and their uses at this link https://www.4over4.com/printing/category/aluminum-signs-printing