The If Aikido were easy, it would be called Quantum Mechanics Plastic sign is a fun way to mark your zone. Surprise your family and friends with our original acrylic signs. They come with rounded corners and one hole at each end for hanging and they are a great gift and very easy to install. The If Aikido were easy, it would be called Quantum Mechanics acrylic sign lasts a long time, even outdoors, without suffering damage to its print. Measurements: Plastic Sign 11.5" x 9"