Feature: 1. High dissolved oxygen rate, release a large number of fine bubbles, increase the contact area with the water surface, promote water circulation, increase dissolved oxygen. 2. Fine bubble, durable frosted material fine air outlet, the bubble is more delicate, achieve the effect of atomization. 3. Low pressure mute and more energy saving, less than 30 db, 1 w air pump can be driven. 4. With large suction suction cup, can better fixed air pipe to prevent the bubble stone running. 5. Made of high quality materials, sturdy, durable and long service life. Specification: Condition: 100% Brand New Item Type: Nano Air Stone Material: ABS + Nano Stone Color: As Pictures Shown Optional Size: S, M S Size: Approx. 10x4cm/3.94x1.57inch M Size: Approx. 20x4cm/7.87x1.57inch Using instructions: 1. Used for fish tank increasing oxygen, used with air tube and oxygenator 2. Please soak the product in water for 15 minutes before use 3. Long-term using, such as dirt blocking, bubble reduction, can be taken out to clean repeated use Using tips: Under the condition that all the accessories of the air pump are connected well, repeatedly unplug the tube of the back door of the fine adjustment valve, let the tube add water, can quickly achieve the effect of atomization . Package List: 1 x Nano Air Stone1 x Suction Cup1 x Suction Cup Bracket