Feature: 1. Quiet: Air bubble stone produces fine, dense bubbles quietly, beautifully and evenly, increasing the oxygen in the tank. 2. Easy To Clean: Nano bubble air stone needs to be cleaned once a month to prevent clogging. Simply soak in water, brush the surface lightly, and let dry. 3. Air Bubble Stone: Air bubble stone produces more bubbles and allows wider contact of gas with the water surface. 4. Durable: Fish tank air stones is durable and a great accessory for home and office fish tanks, aquariums and hydroponic nutrient tanks. 5. Easy To Install: Air bubble stone comes with suction cups for easy installation and can be directly attached to the glass. Specification: Item Type: Nano Bubble Air Stone Material: Bubble Stone . Package List: 1 x Suction Cup1 x Tee Connection1 x Air Saving Valve1 x Check Valve1 x Air Bubble Stone Note: 1. When you use these air stones for the first time, there may be huge bubbles or uneven bubbles, this is not a product problem. You just need to disconnect the air tube, reconnect it and repeat a few times, you will get a beautiful fogging effect.2. Manual measurement, please allow slight error.