Description The item is simple and practical biofilter balls, which are made of cotton and plastic. It can be used in seawater tank, fresh water tank, water tank and aquarium. And its strong filterability can stabilize water quality and reduce fish death. Function -Color: as shown. -Material: cotton, plastic. -Size: about 1.6x1.6x1.6cm. - biospheres for aquarium and aquarium filters. -Perfect for any freshwater or saltwater aquarium or aquarium. -Great fish tank and aquarium with biological filter and provide fish with a fresh environment. - Easy and convenient to use. -Effective to avoid residue and reduce fish mortality and chemical filtration and increase oxygen solubility in aquarium and aquarium. Description The item is simple and practical biofilter balls, which are made of cotton and plastic. It can be used in seawater tank, fresh water tank, water tank and aquarium. And its strong filterability can stabilize water quality and reduce fish death. Function -Color: as shown. -Material: cotton, plastic. -Size: about 1.6x1.6x1.6cm. - biospheres for aquarium and aquarium filters. -Perfect for any freshwater or saltwater aquarium or aquarium. -Great fish tank and aquarium with biological filter and provide fish with a fresh environment. - Easy and convenient to use. -Effective to avoid residue and reduce fish mortality and chemical filtration and increase oxygen solubility in aquarium and aquarium. list of packages 100 x Aquarium Filter