1. brand new and high quality
2. comes with multilayer structure which provides larger surface area without any blocking.
3. it can increase the oxygen solubility
4. easy to clean with best permeability
5. Duck shap air output shap can make the water in the tank have a good circulation
6. reduce noise from air pump and consumes lowest wattage
7. they are suitable for view fishes and especially useful for breeding small fishes.