The Saim New Born Baby Dinosaur Live Action Aquarium Ornament Fish Tank Air Bubbler Decorations is a great way to add some fun to your aquarium. These ornaments are real motion air-driven ornaments that provide entertainment while aerating your tank. They require an air pump and tubing (both not included) for operation. The ornaments are made of plastic and have a base size of 5.5 inches long by 4.5 inches high.