Feature: 1. COARSE MESH: Large hole mesh design, more suitable for large particles filter media, great for granular activated carbon, peat fiber, pellet filter media or other aquarium filter media. 2. ZIPPER CLOSURE: Zipper closure design, easy to operate, easy to use, the zipper does not rust, does not affect the water quality. 3. DURABLE DESIGN: Neatly cut, sewing alignment is straight and standardized, edges and corners fit, not easy to crack and break holes, more durable. 4. IMPROVE THE WATER ENVIRONMENT: Place extra filter bags in the flowing water, put in the right filter material, cultivate a very good ecological water environment, create a quality living environment for fish. 5. DURABLE AND REUSABLE: Made from premium nylon material, these filter bags are durable and can be washed and reused multiple times. Specification: Item Type: Aquarium Filter Media Bags Material: Nylon Use: Fish Tank Filter Bag Mesh Diameter: 2.5mm/0.1in Mesh Bag Size: Approx. 30x40cm / 11.8x15.7in Color: White. Package List: 10 x Aquarium Filter Media Bags Note: All data are measured manually, and there are certain errors in the measurement results.