[High Quality Material] - The main material of the air stone stick aerator is high quality natural stone and plastic material, washable and strong, suitable for fresh and salt water. Great for home aquariums, fish tanks and hydroponics.[Universal Size] - This Air Stone Stick Aerator is about 32cm(L) X 2cm(W), it is the right size for most fish tanks, aquariums and hydroponics. Fits standard 3/16" or 4.7mm ID pipe.[Uniform Fine Air Bubbles] - This Micro Bubble Stone Stick Diffuser distributes fine air bubbles evenly through the cavity, which increases oxygen and enhances aeration and water rolling, bringing fresh gas to the fish tank.[Easy to use and easy to clean] - The air stone should be soaked in water for 1-2 hours before use, the aquarium foam diffuser is connected to the air pump to help create rising air bubbles. When the gas release slows down, just wipe it with a cloth The stone surface is ready to be restored (Never wash with detergent as residual detergent particles can harm your fish.)[Suitable Set] - 2 x 30cm aerator air stones, 3 x aquarium suction cups (for fixing the stones under the aquarium water surface), jet volume: 3.3 L/min. If you have any questions, please contact us in time