43" Air Stone Aquarium Fish Pond Tank Pump Bubble Hydroponics Aerator Diffuser Fish Tank Air Stone creates a circle of bubbles that helps keep fish healthy and adds to the beauty of the aquarium. It produces fine bubbles making it efficient in the replacement of Oxygen in fish ponds, tanks or hydroponic systems. Total Size: Approx. 23mmx138mm (D*H) Stone Size: Approx. 20mm x110mm(D*H) Material: Mineral stone,Plastic Color: Gray Weight:74g