These stickers are the 'window cling' type, meaning they can be moved & re used, simply wipe down the surface of the glass & apply the sticker, smoothing out any air bubbles as you go. With no tape or adhesive required they are a super quick & easy Halloween decoration, to add some spooky fun in an instant. There are various designs of stickers (chosen at random, but if ordering more than 1 set we will try & mix the designs) of varying sizes depending on design, but all the stickers are on a backing sheet measuring 42cm x 30cm.