1.【Function】Rising bubbles improve aquarium ventilation and movement, versatile aquarium lines for decorative and functional air bubbles. 2.【Excellent Performance】Must be used with air pump and trachea, good performance (not included air pump and trachea).It is an important tool to maintain aquatic fish successfully for the breathing process. 3.【Wide Application】For your fish tank or fish tank and the best partner for air pumps. 4.【Good Quality】Made of sandstone + plastic material, your aquarium can pump oxygen more effectively. 5.【Long service life】Can clean long working time with repeated use.Provides your tropical aquarium with fine and constant ventilation. Material: Sandstone,PlasticColour: GreenQuantity: 3PiecesSizes: 10CM/20CM/30CM/50CMProducts Include: 3x Fish Tank Air Bubble 1.Versatile aquarium airstone for decorative & functional air bubbles, Durable, washable. 2.Made of mineral material, it effectively creates water currents and dazzling underwater scenes. 3.It is an important instrument to successfully keep aquatic fish for respiration process. 4.Soak in water for 1 hour before use. 5.Package Content: 3 x Aquarium Airstone.