Our aquarium filter pad is made of durable polyester fibre, featured with strong filtration, high water permeability, easy-to-clean and good durability. Our pads’ consistent, reliable design gives superior filtration for your fish tank. Let your lovely fishes and tortoises enjoy the clean water. Features: Made of polyester fibre, durable, non-toxic and safe for aquarium use. High water permeability and strong filtration. Adopt wetland aquatic plant purification theory to decompose the dirt. Fine fibre can effectively filter impurities in the water. Easy to clean, machine washable and would not be deformed. How to use: Put the wool side upwards, and then lay it on the dry-wet separator. Specifications: Size: 2030cm / 4050cm / 12100cm (Optional) Color: White Material: Polyester Fibre Package Weight: 25-70g Note: 2030cm and 4050cm filters are used for bottom filtration, while the 12100cm filter is especially used for upper filtration. Package List: 1 * Aquarium Filter