Owl Friends is crafted from porcelain and hand dipped in Rick's specially formulated glaze. All of our tiles are handmade in our Michigan studio. Sculpted by Tonya. 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. 4x4” is a nominal size. The actual measurements are 3.75 x 3.75" with raised relief of .5" or less.