This aquarium filter pad is made of high class sponge material for and practical to use. It can be used in seawater tank, fresh water tank, aqua-plant tank. And its strong filter ability and high density design can stable water and reduce fish died. Features -Color:Black -Material:Sponge -Size:16.00X16.00X0.50cm/6.29X6.29X0.20in - Purify your fish tank with this high density filter pad, this filter pad is a nice helper for you. - does not pollute water and can keep , no deformation, free cutting, good softness. - The filter pad has plenty of surface area to create biological filtration. - Use it to create a fresh environment for your home or kitchen. Convenient and practical. - It won’t generate any unwanted smells, safe for you to use. Lightweight, portable, easy to carry and use, it can bring you great convenience. Package list: 48 x Filter Pads