Our hummingbird art tile is crafted from porcelain and hand dipped in Whistling Frog's specially formulated glaze. All of our tiles are handmade in our Michigan studio. There is a notch on back for hanging, yet if you wish to install, it's also suitable for that too. If used outdoors in freezing temperatures, just make sure to keep it vertical. The actual measurements are 2 x 2" with raised relief of .5" or less.