Feature: 1. [Nano Technology Materials] The red bacteria ring uses nano technology materials, rich in a variety of natural elements, which can provide a suitable living environment for biology. 2. [Suitable For Water Circulation] The filter material can supplement the minerals and trace elements needed in the water body for a long time, help the water body to be healthy and restore the natural water. 3. [Space Saving] All bio filter media of bio balls ceramic ring are packed in mesh bags, which can save tank space when doing filtration and make the space look neater and cleaner. 4. [High Efficiency Filtration] The pore structure can be an excellent breeding place for nitrifying bacteria, and the bacterial ring can filter out the bacteria there for high efficiency filtration. 5. [Scope Of Application] The biological filter ring is suitable for fresh water and sea water, suitable for most filters, fish tanks, aquariums, with a wide range of use and easy to use. Specification: Item Type: Filter Media Material: Bacterial Ring Use: Water Filtration in Aquariums and Fish Tanks There is an error of 0-5g.. Package List: 1 Bag x Bacteria Ring Note: There is an error of 0‑5g