Designs are printed on matte or glossy, waterproof calendared vinyl. Sizing is in inches - the length you choose is based on the longest edge of the sticker. Stickers are appropriate for indoor and outdoor surfaces. Vinyl stickers are perfect for cell phone cases, bumpers/cars, water bottles, planners, journals, and laptops. Stickers are one-time use (e.g. not removable/reusable).