Bubble Shape Decoration: This eco-friendly resin is non-toxic, non-polluting and will not fade over time. Suitable for aquariums and circulation systems. Create dazzling water currents and underwater scenes. Blow air bubbles - Connect this decoration to an air pump to increase oxygen and decrease CO2. Create many small bubbles (air pump not included). Enhance the natural landscape of your aquarium to bring vitality to your fish. Simple maintenance: measures approximately 6.8 x 6.8 x 12 cm (L x W x H). Will easily adapt to any aquarium. This decoration will allow you to get the ideal waterscape you dream of. Optimized design: Made with great attention to detail, the resin material is stable. Requires no special maintenance and is easy to clean. Very decorative - Each decoration is carefully packaged to ensure that it is complete without defects and delivered perfectly to you. Designed for both freshwater and saltwater aquariums, can add a touch of mystery to your aquarium, which your fish will have fun in all day long. Due to factors such as as manual measurement and display differences, there may be slight differences between individual products and pictures, please forgive me.