Quantity: 2 piecesColor: BlackUltra quiet design: Our rotating bubble diffuser is designed to effectively avoid annoying noise, so it will never disturb you during operation, perfect for your aquarium.Rotating bubble stone: Our bubble stone has a rotating design, so the size and density of the bubbles are adjustable, you can adjust it freely according to your needs to provide the right amount of air to your aquarium.Wide range of applications: Our adjustable bubble aeration pump suction cups are versatile and suitable for aquariums and fish tanks, providing more air bubbles and oxygen to your aquarium, ensuring your fish a healthy life.High-quality plastic material: Our aquarium aeration pump is made of high-quality plastic material, with fine workmanship, strong and durable, and can be used for a long time.Suction cup: Our air stone is equipped with a suction cup, which can hold the aquarium stably. Please note that frequent cleaning and replacement of the filter cotton can effectively increase the service life.