Are you looking for a professional, yet 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 - filtration performance: the fine filter sponge ensures filtration performance, keeping the fish tank and clear. -Cost-effective: with its reusable feature, the filter sponge offers a cost-effective solution for maintaining a healthy fish tank environment. -Safe material: made of safe materials, the filter sponge the safety of your fish and aquatic plants. -Easy to install: the filter sponge is designed for easy installation, allowing you to replace it effortlessly whenever needed. -Versatile compatibility: suitable for various sizes and types of fish tanks, ensuring optimal filtration for different aquatic environments. Package list: 4 x filter pad