Features: 1. Made from natural zeolite material, it is non-toxic to humans, plants and animals. 2. Quickly adsorbs the harmful ammonia elements in fish tank, supple multiple minerals, let the fish and aquatic plants be more vitality. 3. Applicable for the top filtration of fish tank, bottom filtration and outer filtration. 4. Equipped with a cleaning mesh bag for put the quartz ball into the mesh bag. It is recommended to clean it once every 3 months to achieve a better cleaning and filtering effect. 5. Suitable for aquarium, freshwater aquarium, saltwater fish tank, fish pond, aquaculture, water and other industries. Specification: Condition:100% Brand New Material: Stone Color: As Pictures Shown 1Pc Length: approx.0.5*5cm/0.2*2in Weight: Approx.688g Package list: 1 Box of Zeolite 1 * Mesh Bag . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.