UNIVERSAL MEDIA BAG - Aquarium mesh filter media bag is perfect for small filter media, like pelletized carbon, granular carbon, zeolite, peat, crushed coral, Ammonia remover and ceramic rings, etc. Especially optimal for activated carbon.CUSTOMIZE YOUR AQUARIUM - Mesh filter media bags are perfect for your freshwater, saltwater, or reef tank, small or . You can the filter media best for your fish tank according to your , optimize your filter meet the needs of your aquarium or pond and the fish and livestock you have.HIGH QUALITY - The aquarium filter media bag is made of good quality nylon and the zipper is made of plastic which would not rust and harmful substances. The nylon mesh bags 't tear open, safe, durable, washable and reusable.CULTIVATE WATER ENVIRONMENT - Place High Flow zipper mesh bags filled with your of media in water. Help to create quality living environment for your fish pet. Purified water quality, rapid probiotics cultivation, the high-quality water source in Your fish pet farming need a good water source and manage.size:15x20cmcolour:White , BlackPackage Contents:8 x white aquarium filter bag8 x black aquarium filter bagOnly the above package content, other products are not included.Note: Light 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.