Features: DENSE BUBBLESThis aquarium bubble stone can quietly produce small bubbles, the bubbles are more dense, fine and uniform, and the dissolved oxygen in the water body is larger, making your fish more lively. MAIN FUNCTIONA good way to increase the oxygen in the fish tank, reduce the carbon dioxide level and keep the fish healthy, with a regulating valve, which can adjust the amount of oxygen increase, to meet the use of different environments. EASY USEThis aquarium air stone comes with 2 suction cups, the air stone can be firmly adsorbed on the aquarium or fish tank, easy to install and remove. About 6cm/2.36inch diameter, for 40-90cm/15.75-35.43inch fish tanks. SAFE MATERIALMade of acrylic material, which is safe and environmentally friendly, durable, and can be used in freshwater and seawater tanks, high hardness, easy to clean and can be used for a long time. COMPACT SIZE The air bubble stone can be easily concealed from view due to its slim, compact design, transparent color is integrated with aquatic plants. Great for home, office, hydroponic nutrient tanks, etc. Description: Can quietly produce small bubbles, the bubbles are more dense, fine and uniform, and the dissolved oxygen in the water body is larger, making your fish more lively. Comes with 2 suction cups, the air stone can be firmly adsorbed on the aquarium or fish tank, easy to install and remove. Made of acrylic material, which is safe and environmentally friendly, durable, and can be used in freshwater and seawater tanks, high hardness, easy to clean and can be used for a long time. Specification: Material: Acrylic Color: Transparent Diameter: About 6cm/2.36inch Height: About 7cm/2.75inch Suitable for Aquarium: For about 40-90cm/15.75-35.43inch Package includes: 1pc x Aquarium Air Stone 2pcs x Suction Cup 1pc x Regulating valve Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.