Aquarium Filter Media Bag: 4" L x 3.5" W; Hole: 2 mm. Work great for various large aquarium filter media, such as activated carbon, bio balls, zeolite, ceramic rings, crushed coral, etc.

Fit Multiple Filters: The fish filter media bags are suitable for diverse filters, such as canister filters, power filters, pond filtration systems, etc. Connect all the filter media together to keep your aquarium clean.

Aquarium Fine Mesh Bag: Well sewn with soft but strong Polyester, the aquarium media bag is durable, wear-resistant and reusable. Nothing can pass through the net except water.

Practical Zipper: The opening of the filter material bag is sealed by a top zipper. It always wraps the filter media inside without leaking out. Convenient to open or close the bag for easy replacement of materials.

Reliable & Safe: The reusable mesh filter bag is washable and fade-resistant. No need to worry about contaminating the water. Trustworthy to keep fish healthy anytime and reliable for long-time use.