Decoration: This environmentally friendly resin material is non-toxic, non-polluting and will not fade after long-term use. Suitable for aquarium, fish tank and circulation system. Create dazzling water streams and underwater scenes. Bubble Air: Connect to an air pump to increase oxygen and reduce carbon dioxide. Makes lots of small bubbles (excluding air pump). Add to the natural characteristics of your aquarium and energize your fish. Easy maintenance: Measuring approximately 11(L) x 10(W) x 13(H) cm, it can easily fit into any aquarium. This decor will give you the ideal water view you've been dreaming of. Optimized design: fine workmanship, stable resin material, stable position. No special maintenance required and easy to clean. Very decorative: each bubble jewel is carefully packaged to ensure that it is intact and without defects and perfectly delivered to your hands. Designed for both freshwater and saltwater aquariums, it can add mystery to your aquarium, and your fish will have fun all day long.