Geiserailie 15 Pieces Aquarium Filter Media Bags 150 Micrometer Fine Filter Bags Mesh Reusable with Zipper for Activated Carbon Resins(2.4 x 4 Inch,Nylon)Sufficient quantity: the package contains 15 pieces aquarium filter media bags in white color, with 100 mesh, applied for fine resins filter and activated carbon for fresh or saltwater tanks Fine mesh: the aquarium filter bags adopt 100 mesh fine mesh design, and the mesh diameter is 150 micra, which is suitable for most fish tank filter materials without spilling Zipper pockets: the aquarium filter bags are designed with a zipper closure at the