The fish tank air bubbler is easy to install and use. Simply connect it to an air pump and place it at the bottom of your aquarium. The high-temperature air stones ensure durability and performance. This aquarium air stone piece operates quietly, making it an ideal choice for both household and professional aquariums. Features -Color:Black -Material:Sandstone -Size:16.00X13.00X2.10cm/6.29X5.11X0.83in - Suitable for hose with diameter of 4mm/8mm inner diameter - Note: Soak this product in water for 15 minutes before use! -Even bubble distribution: the bubble stones are engineered to provide an even distribution of bubbles, ensuring optimal oxygenation for your fish tank -Noise reduction: designed with noise reduction technology, these fish tank air bubbler operate quietly, ensuring a serene aquatic environment - hightemperature sintering: the hightemperature sintering process gives the air stones excellent durability, making them ideal for longterm use in any aquarium -Elegant design: the stylish design of the aquarium bubble stone adds a touch of elegance to your fish tank, enhancing its overall aesthetic appeal -Simple to install: installation is straightforward; just attach the air stone pump, and it’s ready to enhance your aquarium’s oxygen levels Package list: 4 x Airstone