Aquarium decoration -Stone for aquarium aquarium air stone Highlights aquarium stone Generic brand Aquarium stone aquarium air stone Description: This is one of the best types of air stones for all hydroponic systems, ponds, aquariums, creates an abundance of small bubbles rather than fast or large bubbles, which is more suitable for shrimp and fish farming; High temperature sintering, generating more oxygen and less CO2, results in a high density of bubbles; Made of high qualified material, non-toxic, safe, eco-friendly, harmless to water and fish; Creates air bubbles, helps increase oxygen levels, reduce CO2 emissions and increase pH. It is not only an important instrument for refreshing the breathing process of aquatic fish, but also can create a magic air curtain like an ornamental landscape, very impressive; With 3 sizes to choose from depending on the size of your aquarium, it will work with many types of air pumps; specification: Material: Mineral Stone+Plastic 10cm-107x19mm/4.21x0.75inch, 139mm/5.47inch Package includes: 2 pieces Air Stone Note: Due to manual measurement and light effects, there is a slight difference between the size and the color of the above and that of the actual item.