Feature: 1. Multi-purpose, not only can add a scene for aquarium can also increase oxygen. 2. Imitate volcano shape, vivid image, add unique charm for fish tank. 3. Connect oxygen pump, air bubble is uniform, air bubble quantity is large. 4. Made of sand stone, no effect on fish, safe and reliable. 5. Can soak completely in aquarium decoration fish tank, let fish tankbecome good-looking. Specification: Condition: 100% Brand New Item Type: Bubble Stone Material: Sand Stone Color: White Red Quantity: 1PCS Suitable: Aquarium, Fish Tank, etc Maximum Air Volume：6L / min Weight: Approx. 164g Bottom Size(LxW): Approx. 5.3x5.5cm/2.09x2.17inch(Not Contain Interface) Height: Approx. 7.4cm/2.91inch Using explanation: 1. Please connect this product with air pipe (purchased separately). Air pump at the other end (need to be purchased separately) 2. Please use this product before soaking for 15 minutes. It is better to blow several times to make the air hole unobturable 3. Use for a long time, if dirt is blocked, bubble reduces, can use repeatedly clean, it is necessary to brush gently with soft brush 4. It is recommended to use more than 5w air for better results . Package List: 1 x Bubble Stone