Holographic water-resistant (so outdoor and vehicle-surface appropriate!) PVC vinyl decal stickers of Dragonsworn dice. Each decal measures about 3″ in diameter, and the holo refraction is AWESOME because I love shiny things.
Usage directions: carefully remove the decal backing, which is the shinier white side. In my experience this works best if you leave the decal on a flat surface and peel the backing off the sticker rather than the sticker off the backing. Apply the sticker side to a clean, dry surface, and use something like a credit card to smooth any air bubbles or wrinkles and then carefully peel off the transfer paper. If any of the die numbers come loose, you can use a thin tool like tweezers or a mechanical pencil to pop them back in place.