These items were handmade from clay and kiln fired at temperatures around 2000 degrees. They can be used in projects outdoors as well as in. There are 2 tiles measuring approximately 3/16 inches thick. Please see pictures for accurate shapes and sizes. The painting on the ones you purchase may not be exact as they are original tiles and no two are exactly alike. These have been left unfinished on the back so it will adhere for mosaic tile use. For a small additional fee many of my pottery tiles can be made with either holes or finished backs for use as jewelry, please just ask........ These items can be made in different colors as well. ~*Great tiles*~ for your next Mosaic Masterpiece........ Thanks for visiting my product and have a wonderful day! PLEASE NOTE: All of the tiles in my products are handcut by my daughter and I and we are both "Licensed Glaziers" by the State of Connecticut, Dept. of Consumer ProtectionAnalyzing "Smart Counters" only @ inkFrog.com