Features: brand new and high quality Multi-filtration Functions: Provide both mechanical and biological filtration, and supplying the water with much needed oxygen, reduces noise from air pump and keeps water cycled and clear. Equipped with small air stone: This aquarium air bubble supply the water with oxygen quietly. Refining bubble will be a scenery for your aquarium as well. Easy to set up and disassembled: Simply install an airline into the biochemical sponge filter and turn on the air pump, this filter can be disassembled to clean the sponge, activated carbon sticks, and bio balls regularly. Wide Application: Safe for fish, suitable for shrimp for tank, betta for tank, breeder for tank, goldfish, guppies, fry, and baby fish tanks. Mini design: Size is about 8x8x8 for cm/3.15x3.15x3.15 inches. Save space inside the aquarium for tank, more beautiful. Recommend for small fish for tank length less than 40 for cm/15.75 inches. Specifications: Material: Plastic, Sponge, Activated Carbon, Bio Balls, Air Stone Color: Green/Blue/White Size: Approx.8x8x8cm/3.15x3.15x3.15in Weight: Approx.205g Package Includes: 1 Piece Aquarium Biochemical Sponge Filter (Green/Blue/White) note: 1.Please allow 0-1cm 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!