Are you looking for a professional filter for fish tank and aquarium? Are you in search of a sturdy, trustworthy tool that can do multiple jobs? , ! Our filter sponge, made of reliable material, must meet your needs. Effective to avoid residue and reduce the death rate of fish and chemical filtration and increase the oxygen solubility in aquarium and fish tank. Features -Color:Black -Material:Sponge -Size:13.00X12.30X4.10cm/5.11X4.83X1.61in - High density design, not easy to damage. The material of the filter sponge will not be crushed to achieve the filtering effect and smooth water. - Suitable for sea water tank, fresh water tank, water tank, fish tank, tank bottom tank or drip filter aquarium. Regular cleaning, after cleaning can be reused. - You can easily cut this filter sponge pad as needed. Choose the right size for your filtration system. Give you more convenience to filter. - It's easy to clean. Effectively avoid residues, reduce fish mortality and chemical filtration, increase oxygen solubility in aquariums and fish tanks. - Use this filter sponge in the fish tank to get the and bring a clean environment to your fish. You can use it with confidence. Package list: 6 x filter pad