Quantity: 50 piecesMaterial: Plastic + CottonColor: BlackDiameter: 2.6 cm/1 inchThe product consists of 50 simple and functional biofilter balls with plastic construction and high-performance cotton filling, ideal for oxygen supply for water and gas exchange. Comes with a mesh bag to store these bio balls.Easy to rinse and use, porous design for better bacterial filtration, lightweight and easy to carry. The filter balls provide a large surface area for bacteria, resulting in very high natural biological filtration efficiency. Sufficient quantities can meet your different needs.Aqua Filter biospheres are ideal for oxygenating water and assisting in the gas exchange process. A great helper for restoring water quality and providing the most suitable habitat for fish. Perfect for any freshwater or saltwater aquarium or mini reef tank. As the water flows through the internal space, nitrifying bacteria are used to increase the time required to achieve the biochemical filtration effect. Pond filter beads do not need to be replaced, only when they are damaged or damaged. Suitable for UVC filters, external filters or filter basins in aquariums or ponds. It is ideal for providing oxygen to the water and for gas exchange. It can help create a comfortable living environment for aquatic life.