Fish Tank Media Bag,Uses high quality nylon materials;remove impurities and harmful bacteria from water;Keep the water clear, oxygen-rich,suitable for fish growth Comes fitted with a easy fastening zip,Filter bags reusable The hole sizes are designed to allow the ease of water movement to flow through the filter media without restriction. The filter media bag suitable for use in a variety of filters including canister filters, power filters, wet/ dry filters and pond filters for your tanks, good for use in freshwater tank.And also could be used for laundry small things from getting tangled up in the wash or for keeping small items in luggage. Package content3 Pcs Aquarium Filter Bags Product color: white Product size: 15*20cm