WIDE APPLICATIONS Disc Air Stones are perfect for freshwater, saltwater aquariums, hydroponic or aquaculture farms, aquaculture, creating stunningly beautiful underwater scenes. Durable The high temperature sintered gas plate is made of high temperature sintering. The material is durable and can be washed repeatedly for long-term use. Quietly produces small and dense bubblesEliminates smooth bubbles that are smaller and denser than others, and the sound is quieter when the bubbles burst in water. It can produce fog effect and light beam Bubbles will turn your aquarium into a wonderland. Super quiet air pump No gears, no motor inside, no vibration, reduces operating noise to a whole new level, less than 35dB, won't wake babies sensitive to sleep. You can always enjoy a good read or take a nap. Energy-saving aquarium air pump It has the characteristics of low power consumption and stable air volume, and it will continuously pump air in your aquarium with little impact on your energy bill.Truly a great choice for any home aquarist. Diameter: 25 mm/0.98 in Scope of supply: 10 * pumice stone "Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be some difference of color, depending on the physical object received Delivery quantity: (according to the main image)