Feature: 1. Zipper Closure Design: Aquarium filter media bags are designed with a zipper closure, easy to operate and easy to use, the zipper does not rust and does not affect the water quality. 2. Nylon Mesh: Made of nylon mesh, these filter bags can be used multiple times without tearing or wearing out. Neatly cut, sewing alignment is straight and standardized, edges and corners fit, not easy to crack and break holes. 3. Optimal Filtration: The 2.5MM diameter mesh size allows water to flow freely while effectively trapping debris, ensuring clean and clear aquarium water. 4. Versatile Application: These bags are suitable for various filter media such as activated carbon, ceramic rings, and bio balls, providing versatile filtration options. 5. Aquarium Accessories: Nylon net filter bags cultivate a very good ecological water environment and create a quality living environment for fish. Specification: Item Type: Aquarium Filter Media Bags Material: Nylon Use: Fish Tank Filter Bag Mesh Size: Diameter: Approx. 2.5mm / 0.1in Bag Size: Approx. 23 x 33cm / 9.06 x 12.99in Color: White. Package List: 10 x Filter Bags Note: There is 0‑1CM error