More fun than fright, our Duo Spider Window Poster will make any double window in your home feel like its been taken over. Purchase multiple sets to give your home that “House Full of Spiderwebs” feel! WOWindow Posters are backlit plastic window posters (34.5″x60″) that light up with inside lights for the surprise of passersby. Just hang them up in 30 seconds and leave your lights on. Our posters will do the rest! Our posters are the highest quality special effect available for thematic window decorating.