Features: Suitable for the small fish for tank, shrimp for tank, round fish for tank, and the fish for tank with inconvenient pump installation. It can clean the water of the aquarium and improve the living environment for your fish. It can improve the oxygen content in the fish for tank, increasing the survival rate. It has the function of culture nitrifying bacteria. This product needs to cooperate with the oxygen pump. Aquarium Filter only, other accessories demo in the picture is not included Specifications: Material: Cotton + Plastic Size: app.10x3cm/3.94x1.18in Color: Black + Clear Quantity: 1 Pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Includes: 1 x Aquarium Filter