This aquarium filter pad is made of safe material for durable and practical to use. It can be used in seawater tank, water tank, aqua-plant aquarium. And its strong filter ability and high density design can stable water and reduce fish died. Effectively avoid residues, reduce fish mortality and chemical filtration, increase oxygen solubility in aquariums and fish tanks. No need to replace it frequently. It can be used repeatedly, and is highly durable and . Feature - Color: Black. - Material: Biochemical cotton - Size: Approx. 50.00X12.00X2.00cm/19.65X4.72X0.79in - 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, 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 cotton 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 cotton 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 Aquarium Filter Cottons