5pcs Black White Aquarium Mesh Bag Aquarium Pond Filter Net Bag For Bio Ball Carbon Media Aquarium Fish Tank Isolation Bag Features: Versatile media bags are designed for filtration applications, these media bags hold carbon, ammonia remover resins, or any other type of filter media. Keep media in these media bags and prevent fines from washing out. These bags provide a convenient way to customize aquarium filtration. Allow precise placement of filter media Prevent media from entering your filter system Great for bio-balls, activated carbon, ceramic and ammonia removerEasy to clean 100% Brand new and high quality Material: Anti-corrosion nylon Color: black Size: approx. 10cmx15cm/16cmx22cm/12cmx18cm/15cmx20cm/15cmx25cm/20cmx30cm/25cmx30cm/25cmx35cm Package includes: 5pcs Filter Media Bags Note: 1.Please allow 1-2cm differences due to manual measurement, thanks. 2.Please understand because of the light irradiation or computer display difference, the item`s color might be slightly different from the pictures.