All set-to-use mounting adhesive that mounts to any surface. Just insert the paper during the back again between the highest and bottom flaps to help keep it secure and guarded. Broad use on the holder: The holders are perfect for both of those indoor and out of doors use because https://s3.us.cloud-object-storage.appdomain.cloud/digitalasset/DisplayHolders/Custom-Acrylic-Signs.html