From the photo lab:
“MetalPrints™ represent a new art medium for preserving photos by infusing dyes directly into specially coated aluminum sheets. Because the image is infused into the surface and not on it, your images will take on an almost magical luminescence. The ultra-hard scratch-resistant surface is waterproof/weatherproof and can be cleaned easily – just avoid direct sunlight.
You've never seen a more brilliant and impressive print! Colors are vibrant and the luminescence is breathtaking. Detail and resolution are unsurpassed.”