These clocks come in two shapes (round and square) and two sizes. Each clock has a keyhole at the back for easy hanging on a wall. They're made from an acrylic material that looks like glass but is more durable and sturdy. .: Material: 100% acrylic .: Round and square shape options .: Two size options (10.75''×10.75'' and 8''×8'') .: Requires one AA battery (NOT included) .: Includes keyhole hanging slot