These are stickers on foil resembling mirror materials (e.g. gold, silver, chrome etc.). The uniqueness of these materials lies in the non-standard surface, which looks elegant and unique by itself, and a well-chosen pattern of stickers will make they will raise the prestige of your project. White color in the design, the standard will be the color of the substrate, so the appropriate selection of the foil will allow you to get an incredibly interesting effect.