Decals are waterproof & dishwasher safe, are UV protected, scratch resistant and can be used both indoors & outdoors. Each sticker measures 3" at its longest side. Questions? Add into or use instead of greeting cards or add your personal touch using these stickers on: Laptops, car windows + bumpers, water bottles, binders, lockers, musical instruments and their cases, mirrors, windows and more! Any hard surface will do!