Great for use indoors when nails, screws, or similar methods aren't an option or when you need to hang your banners on glass windows. Our suction cup hooks have a small triangular pull tab which is used for breaking the seal during removal, and it is needed. Each suction cup is hook capable of supporting three pounds (if you're tugging on the hook itself to try and detach it, it seems like a lot more). Combine these with our 12 oz. indoor or window banners and — with the possible exception of very large banners — these will work marvelously.
Ordinary suction cups focus light passing through it like a magnifying glass. Our suction cups are light-diffusing and perfect for hanging signs because these suction devices let light pass harmlessly through, keeping your sign safe. Besides that, they operate the same way - press them flat to squeeze out the air, and then release, creating a vacuum seal as the suction cup hook tries to return to its original shape.