Our Ceramic tiles Coasters are hand made. After they are glazed, they are fired again at 800+ degrees. The Coasters have a wood back. The coaster can be hung up as a picture, it can stand up as a standing picture or it can be placed flat as a coaster. If you wish to use them outdoors as a picture, just submerge them in water for about 20mins, when they come out of the water the back fitting of the tile should easily come off and then stick or tile the Ceramic Art to the wall using a suitable adhesive. It will brighten up any area with the vibrant colourers of the Ceramic Art.