Features: brand new and high quality Made of eco-friendly sponge and high-quality plastic, safe to all fish. Good filtering effect, can absorb harmful substances and increase oxygen. Adopt biochemical filtration, more effectively to filter impurities in the water and stabilize the water quality of the fish for tank. Come with two fixed suction cups, powerful suction to prevent falling off. Suitable for freshwater saltwater water tanks and all kinds of ornamental fish breeding, especially for colorful fairy, small fish, shrimp for tank, betta for tank etc. You can take down the sponge from the filter easily to clean or replace it. Package Includes: 1 Piece Aquarium Biochemical Sponge Filter (4 Styles) Specifications: Material: Plastic, Sponge Color: 4 Styles As Pictures Show Size: Style 1-Approx.14.5x4.7x15.5cm/5.70x1.85x6.10in Style 2-Approx.7.5x29cm/2.95x11.41in, Sponge Diameter Approx.4.7cm/1.85in Style 3-Approx.10.5x35cm/4.13x13.77in, Sponge Diameter Approx.5.8cm/2.28in Style 4-Approx.16.7x35cm/6.57x13.77in, Sponge Diameter Approx.5.5cm/2.16in Weight: Approx.220g 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