Features: 1.FINE MESH: The aquarium filter bag is designed with fine mesh for better filtration, perfect for granular activated carbon, peat fiber, granular filter media or other aquarium filter media. 2.NYLON MATERIAL: Aquarium filter media bag is made of premium nylon material, no odor, not affected by bleach, alkali, acid, does not contain metals that are easy to rust and pollute the water, safe for fish. 3.ZIPPER DESIGN: Secure zipper closure, no loosening, prevents loose media from spilling and damaging the motor of the pump or power filter. It also prevents spilled filter media from being eaten by fish. 4.EASY TO USE: Place extra fish tank filter bags in flowing water, put in the right filter media to cultivate a very great ecological water environment and create a premium living environment for your fishes. 5.WASHABLE AND REUSABLE: Fish tank net filter bag, both freshwater and saltwater can be used, sturdy and not easy to break, can be washed and reused many times, environmentally friendly. Specification: Item Type: Aquarium Filter Media Bags Material: Nylon Mesh Size: Diameter 1.5mm/0.06in Mesh Bag Size: Approx. 18 x 25cm / 7.1 x 9.8in Color: White Use: Fish Tank Filter Bag PackageList: 10 x AquariumFilterMediaBags Note Manual measurement, please allow 0?0.4in error.