Description This item is an air stone that is sintered at high temperature. It looks like a round cake with an air pump interface. With the delicate surface and uniform air outlet, it can be used to transport oxygen to fish and other living things, not only in the fish tank, but also in the pond, aquarium and other places. Features - Colour: As the image shows. - Material: sand. - Size: 4 x 4 x 1.5 cm / 1.6 x 1.6 x 0.59 inches (L x W x H). - Easy to use: connect it to the air pump and put it into the water, helping the air pump to pump oxygen into the water. - High quality and hard material, good for long-term use and safe for living things. - Can be washed several times. - Beautiful air bubbles add beautiful scenery to the aquarium and fish. Package Including 4*4cm Air Stone for Aquarium Air Bubble Stone Oxygen Stone for Fish Tank Round Oxygen Diffuser
