White on one side, aluminum on the other. Both sides are covered with protective film. I now have one sheet left, plus some quarter sheets. Price is $55 for the 8x4 sheet. Easy to saw, router, bend and fold. There are some YouTube videos. Perfect for all-weather panels in construction or signage, From the website: Aluminum composite material comprised of one pre-painted (white) aluminum panels on one side, bare aluminum on the other side, bonded to a solid polyethylene core Lightweight and durable substrate Resists scratching and denting better than wood panels Ready for vinyl, screen print inks, paint, cutting and routing Specifications ColourWhite Length96" Width48" Thickness3 mm Finish Gloss MaterialAluminum Two Sides Polyethylene Core Digital SubstrateNo UL Recognized or Listed Yes Face Thickness.15 mm