Features: With Biochemical sponge in the filter box,helps to improve water quality. Increase the oxygen solubility,Make the water of fish tank become fresh and clear Easy to clean and more convenient to use,It can absorb oil effectively and other pollutants to maintain water quality. A effective tool to keep your aquarium healthy and cleaning. Specifications: Material:Sponge,Plastic Size: Sponge Diameter 7.0cm(2.75in) Sponge Height 7.5cm(2.95in) Box Diameter 7.5cm(2.95in) Box Height 9.1cm(3.58in) Color：As pictures show Quantity: 1 Pc Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1Pc x Sponge Or 1pc emapy bo Or 1pc box with sponge (No retail package)