Item Type: Filter Cotton_x000D_ Material: Cotton_x000D_ Product Size: Approx. 101x51cm / 39.8x20.1in 1This fish tank filter cotton is made of high quality filter material, high strength, washable, not easy to deform, and simple to clean. 2This fish tank filter has an excellent filtering function. The aquarium filter is absolutely safe for all fish and other aquatic organisms. 3It is made of polyester cotton material, which can be reused many times, and can be easily cut into any size required with scissors, with high utilization rate. 4The three dimensional weaving process is not easy to form an oxygen layer, and the filtration has a certain cultivating effect at the same time. 5Our aquarium filter mats are ideal for freshwater or seawater aquariums, and can be used for wet and dry filters, pumps, tank filters, waterway systems, etc.Please allow 0.5?1cm / 0.2?0.4in error due to manual measurement. Thanks for your understanding.1 x Filter Cotton