Sufficient Quantity: Package Contains 30 White Aquarium Filter Media Bags with 100 Meshes for Fine Resin Filters and Activated Carbon for Freshwater or Seawater Tanks Fine mesh: The aquarium filter bag is designed with 100 mesh fine mesh with a mesh diameter of 150 Micrometres, which is suitable for most fish tank filter materials and not overflow Zippered pocket: The opening of the aquarium filter bag is designed with a zipper closure, compared to the traditional drawstring design, the zipper seal not only facilitates changing the filter material, but also ensures that the filter material does not overflow Appropriate size: The aquarium filter bag is a good size, suitable for most aquarium fish tanks; you can fill the appropriate amount of filter material according to the actual situation. Improve water quality: The fine filter zipper mesh bag provides a good water habitat for your fish tank, it plays an important role in purifying water stains, giving your pets a good living space Colour: White Material: nylon Size: 15 x 20cm Package Contents: 30 x white aquarium filter bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.