Coop (Co-O-P) Spelled with Periodic Elements! Our original Periodic-Tees Elements design. This high-energy tee contains elements Cobalt, Oxygen, and Phosphorus! -- Choose from our vast selection of art prints and posters to match with your desired size to make the perfect print or poster. Pick your favorite: Movies, TV Shows, Art, and so much more! Available in mini, small, medium, large, and extra-large depending on the design. For men, women, and children. Perfect for decoration.