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 Cup 1 x Suction Cup Bracket