Beautyflier Pack of 10 in 8'' x 6'' Fish Tank Filter Mesh Bags with Plastic Zippers, Aquarium Pond Filter Bag Package include 10PCS mesh bags. Zipper closure for reusable purpose Easy to partner with any aquarium tank To stock anything you dont want fish to touch in water, like Bacteria Ball, Active Carbon. Great for bio-balls, activated carbon, ceramic and ammonia remover Prevent media from entering your filter system. Allow precise placement of filter media Please Beware the Seller Name while go foward "add to cart" as the thread / dimension should be matched with illustration and this sold by " Kloud City".