The filter pads are made of premium quality cotton material, which can be reused and is very practical. Best for decomposing fish manure and remaining floating particles. It can be used in seawater, freshwater,s and aquatic tanks. Its powerful filtration can stabilize water quality, keep the , and air circulation, and reduce fish death. Feature - ColorTransparent - Material: Cotton - Size: 18.50x7.20x2.00cm/7.27x2.83x0.79inches - Effective filtration: Providing an ideal environment for your aquatic pets, this gasket filters out fish droppings and floating food and other debris. - Healthy environment: These great fish tank and aquarium filter pads allow your fish, turtles, and all aquatic pets to have a , a home that can breathe normally. - Increase air circulation: Effectively avoid , reduce mortality of fish and chemical filtration, and increase oxygen solubility in aquariums and fish tanks. - Premium-quality material: Multi-layer cotton filter pad, encrypted and thickened, not easy to fall off, and can be repeatedly cleaned and used. - Multiple purposes: Ideal for saltwater tanks, freshwater tanks, aquatic plants, coral reef tanks, etc. it can be cut to the right size. Package list: 12 x Filter Pads