Description If you are looking for a professional and affordable filter cotton for your external hanging fish tank filter , then your research is over here. That's because ourfilter cottoncan satisfy your need. It is easy and convenient for you to use. It will be the good choice for you. Features -Color:Black -Material: Sponge-Size: About7.50X4.50X3.50cm/2.95X1.77X1.38inch - Fine material and highly efficient filtration of impurities in water. - Purify your fish tank with this high density filter pad, a nice helper for you. - High-quality material does not pollute water and can keep water clean, no deformation, free cutting, good softness. - The filter pad has plenty of surface area to create superior biological filtration. - Effective to avoid residue and reduce the death rate of fish and chemical filtration and increase the oxygen solubility in aquarium and fish tank. Packing list: 10 x fish tank filter pads