General description The AlwaysH 4 Pieces Aquarium Air Stone is designed to enhance the oxygen levels in your aquarium or hydroponic system. With a focus on producing fine bubbles, these air stones ensure that your aquatic creatures remain active and healthy. Technical specifications Ball height: approximately 5 cm (2.0 in) Ball diameter: 4 cm (1.6 in) Suitable for 4 mm inner diameter air pipes Compatibility and accessories Compatible with small and medium air pumps Ideal for small and medium-sized aquariums and hydroponic systems Usage To use the air stones, connect them to a compatible air pump using a 4 mm inner diameter air pipe. Place them in your aquarium or hydroponic system to promote oxygen diffusion and enhance the health of aquatic life.