Based upon The Iron Druid Chronicles ™ series of books by Kevin Hearne  these stickers are printed on all-weather 4mil vinyl, and can be used on cars, laptops, or any reasonably smooth, non-porous surface. They will stay on through Wisconsin weather, but peel off easily without residue. They are not reusable.

The rectangular stickers are each 7 1/2" x 3 3/4" (7.5" x 3.75").