Features: 1.LARGE HOLE MESH: Aquarium filter media bags adopts large hole mesh design, more suitable for large particle filter material, ideal for granular activated carbon, peat fiber, granular filter or other aquarium filter material. 2.ZIPPER CLOSURE: Zipper sealing design, simple operation, easy to use, zipper does not rust, does not affect the water quality. 3.FINE CRAFTED: Aquarium filter media bags adopts neat cutting, sewing line straight standard, corner fit, not easy to crack holes, more durable. 4.UPERIOR LIVING ENVIRONMENT: Place extra filter bags in the flowing water, put in the right filter media to cultivate a very excellent ecological water environment and create a quality living environment for fish pets. 5.REUSABLE AND WASHABLE: These bags are reusable, simply remove the filter media, rinse the bag, and it's start to use again. Economical and eco friendly solution for aquarium filtration. Specification: Item Type: Aquarium Filter Media Bags Material: Nylon Use: Fish Tank Filter Bag Mesh Hole Size: Diameter: Approx. 2.5mm/0.1in Mesh Bag Size: Approx. 14x20cm / 5.5x7.9in PackageList: 10 x AquariumFilterMediaBags Note Manual measurement please allow 0?1cm/0?0.4in error.