Feature: 1. Stable Performance: Aquarium sponge filter is made of premium plastic and filter sponge, the ultra quiet design provides a good living environment for fish without disturbing them. 2. Cyclic Filtration: The double sponge filter's two sponges have a dual function, creating a biological filter during filtration, providing a larger area and accelerating circulation to maintain cleaning effectiveness. 3. Easy to Operate: Aquarium sponge filter is easy to install, soak the filter sponge with fish tank water first, then connect the air duct to the small nozzle, then turn on the air pump to provide fish filtering function. 4. Suction Cup Fixed: Aquarium double sponge filter is equipped with 2 suction cups, can be installed anywhere on the fish tank glass, simple and generous design does not affect the beauty of the fish tank. 5. Caution: Aquarium sponge filter needs to be connected with air pump to produce large amount of air bubbles to increase the oxygen content of fish tank water. Specification: Item Type: Aquarium Sponge Filter Material: Plastic, Filter Sponge Suitable for Tank: Approx. 60cm/23.6in or Less Fish Tank Telescopic Tube Length: Approx. 195mm-275mm/7.68-10.83in. Package List: 1 x Aquarium Sponge Filter2 x Suction Cup 2 x Filter Media Box Note: Please allow some error in manual measurement.