The Ulifery Baby Tree Groot Fish Tank Decorations with Bubbler Toy Air Ornament Figurines Aerating Aquarium Decorations is a modern and stylish way to decorate your fish tank. The set includes one blue groot figure and one air stone that are easy to install. The groot is made of stone and has a bubble release mechanism in his head. The air stone comes with a built-in pump for creating bubbles. The set is perfect for any fish tank and is sure to attract attention.